1. No category

SOCIETY OF ACTUARIES
EXAM MLC Models for Life Contingencies
EXAM MLC SAMPLE SOLUTIONS
The following questions or solutions have been modified since this document was
prepared to use with the syllabus effective spring 2012,
Prior to March 1, 2012:
Questions: 151, 181, 289, 300
Solutions: 2, 284, 289, 290, 295, 300
Changed on March 19, 2012:
Questions: 20, 158, 199 (all are minor edits)
Changed on April 24, 2012:
Solution: 292
Copyright 2011 by the Society of Actuaries
Some of the questions in this study note are taken from past SOA examinations.
MLC-09-11
PRINTED IN U.S.A.
Question #1
Answer: E
2
q30:34  2 p30:34  3 p30:34
2
p30   0.9  0.8   0.72
2
p34   0.5  0.4   0.20
2
p30:34   0.72  0.20   0.144
2
p30:34  0.72  0.20  0.144  0.776
3
p30   0.72  0.7   0.504
3
p34   0.20  0.3  0.06
3
p30:34   0.504  0.06   0.03024
3
p30:34  0.504  0.06  0.03024
 0.53376
2
q30:34  0.776  0.53376
 0.24224
Alternatively,
2 q30:34  2 q30  2 q34  2 q30:34
b
g
 2 p30q32  2 p34q36  2 p30:34 1  p32:36
= (0.9)(0.8)(0.3) + (0.5)(0.4)(0.7) – (0.9)(0.8)(0.5)(0.4) [1-(0.7)(0.3)]
= 0.216 + 0.140 – 0.144(0.79)
= 0.24224
Alternatively,
2
q30:34  3 q30  3 q34  2 q30  2 q34
 1  3 p30 1  3 p34   1  2 p30 1  2 p34 
 1  0.504 1  0.06   1  0.72 1  0.20 
 0.24224
(see first solution for
MLC‐09‐11
2
p30 ,
2
p34 ,
3
p30 ,
3
p34 )
1
Question #2
Answer: E
1000 Ax  1000  Ax1:10  10 Ax 



10
 1000   e0.04t e 0.06t (0.06)dt  e 0.4 e 0.6  e 0.05t e 0.07t (0.07)dt 
0
 0


10
 1000 0.06 e 0.1t dt  e 1 (0.07)  e 0.12t dt 
0
0


0.10 t 10
0.12 t  

 1000 0.06   e0.10   e 1 (0.07)   e0.12  
0 

0


1 
1  e 1   0.07
 1000  0.06
 0.12 e 
 0.10 
 1000  0.37927  0.21460   593.87
Because this is a timed exam, many candidates will know common results for
constant force and constant interest without integration.
For example Ax1:10 
10 E x
Ax 

 
e
1  10 Ex 
10    

 
With those relationships, the solution becomes
1000 Ax  1000  Ax1:10  10 Ex Ax 10 



0.06 
0.07  
 0.06  0.04 10
 0.06 0.04 10 
 1000 
e 
 1 e


 0.07  0.05  
 0.06  0.04 


 1000  0.60  1  e 1  0.5833 e 1 


 593.86
MLC‐09‐11
2
Question #3
Answer: D


1
dt
20
1  100 
5
0.07 t  
 

  e

0
20  7 
7
2

1
1 
bt vt t px  x t dt   e0.12t e 0.16t e0.05t
dt   e0.09t dt
0
20
20 0
1  100  0.09t  5
 
 
 e
0 9
20  9  
E  Z    bt v t t px  x t dt   e0.06 t e 0.08 t e 0.05 t
0
0
E  Z 2   

0
 
2
5 5
Var  Z       0.04535
9 7
Question #4
Answer: C
Let ns = nonsmoker and s = smoker
k=
q xb  kg
ns
pxb  kg
q xb gk
s
p x k
0
.05
0.95
0.10
0.90
1
.10
0.90
0.20
0.80
2
.15
0.85
0.30
0.70
1 ns
A x:2  
ns
v q x  
1
 0.05
1.02
A x:2 
1 s
v
1
1.02
ns
px 
v2
1
1.022
s
qx 
ns
ns
0.95  0.10  0.1403
 v2
 0.10  
qx 1
1
1.02 2
s
px 
q x 1
s
0.90  0.20  0.2710
A1x:2  weighted average = (0.75)(0.1403) + (0.25)(0.2710)
= 0.1730
MLC‐09‐11
3
s
Question #5
Answer: B
 x    x1   x 2    x 3  0.0001045
t

px   e 0.0001045t


1
APV Benefits   e  t 1,000,000 t px    x  dt
0
  t
 e
0

2
500,000 t px    x  dt


3
  e  200,000 t px    x  dt
0

1,000,000  0.0601045t
500,000  0.0601045t
250,000  0.0601045t
e
dt 
e
dt 
e
dt


2,000,000 0
250,000 0
10,000 0
 27.5 16.6377   457.54
Question #6
Answer: B
EPV Benefits
1
 1000 A40:20
EPV Premiums   a40:20 


 k E401000vq40k
k  20

 k E401000vq40k
k  20
Benefit premiums  Equivalence principle 
1
1000 A40:20


 k E401000vq40k
k  20

  a40:20   k E401000vq40 k
20

1
 1000 A40:
20

/ a40:20
161.32   0.27414  369.13
14.8166   0.27414 11.1454 
 5.11
1
and was structured to take
While this solution above recognized that   1000 P40:20
advantage of that, it wasn’t necessary, nor would it save much time. Instead, you
could do:
MLC‐09‐11
4
EPV Benefits  1000 A40  161.32
EPV Premiums = a40:20 
  a40:20 

20 E40  k E60 1000vq60  k
k 0
20 E40 1000 A60
  14.8166   0.27414 11.1454     0.27414  369.13
 11.7612  101.19
11.7612  101.19  161.32

161.32  101.19
 5.11
11.7612
Question #7
Answer: C
ln 1.06 
 0.53  0.5147
0.06
1  A70 1  0.5147

 8.5736
a70 
d
0.06 /1.06
 0.97 
a69  1  vp69a70  1  
  8.5736   8.8457
 1.06 
A70   A70 
i
 2
   2  a69    2   1.00021 8.8457   0.25739
a69
 8.5902
 m  1 works well (is closest to the exact
m
Note that the approximation ax   ax 
2m
answer, only off by less than 0.01). Since m = 2, this estimate becomes
1
8.8457   8.5957
4
Question #8 - Removed
Question #9 - Removed
MLC‐09‐11
5
Question #10
Answer: E
d = 0.05  v = 0.95
At issue

49



A40   v k 1 k q40  0.02 v1  ...  v50  0.02v 1  v50 / d  0.35076
k 0
and a40  1  A40  / d  1  0.35076  / 0.05  12.9848
so P40 
1000 A40 350.76

 27.013
a40
12.9848
E  10 L K 40  10   1000 A50
Revised
 P40 a50
 549.18   27.013 9.0164   305.62


Revised
where
Revised
A50
and
24
  v k 1 k q50
Revised
k 0
Revised
a50

1  A
Revised
50


 0.04 v1  ...  v 25  0.04v 1  v 25 / d  0.54918
 / d  1  0.54918 / 0.05  9.0164
Question #11
Answer: E
Let NS denote non-smokers and S denote smokers.
The shortest solution is based on the conditional variance formula



Var  X   E Var  X Y   Var E  X Y 

Let Y = 1 if smoker; Y = 0 if non-smoker
1  AxS
E aT Y  1  axS 



1  0.444

 5.56
0.1
1  0.286
Similarly E aT Y  0 
 7.14
0.1

 
E E aT Y

   E  E  aT 0    Prob  Y=0   E  E  aT 1   Prob  Y=1
  7.14  0.70    5.56  0.30 
 6.67
MLC‐09‐11
6
 
E  E aT Y



2



2
2
  7.14  0.70   5.56  0.30 
 44.96
 
   44.96  6.672  0.47
E  Var  aT Y     8.503 0.70    8.818  0.30 
Var E aT Y
 8.60
 
Var aT  8.60  0.47  9.07
Alternatively, here is a solution based on
 
Var(Y )  E Y 2   E Y   , a formula for the variance of any random variable.
This can be
2
 
transformed into E Y 2  Var Y    E Y   which we will use in its conditional
form

E aT

2

2




NS  Var aT NS   E aT NS 


 
Var  aT   E  aT

2

 E  aT 


2
2
E  aT   E  aT S  Prob S  E  aT NS  Prob  NS
 0.30axS  0.70axNS


0.30 1  AxS
  0.70 1  A 
NS
x
0.1
0.1
0.30 1  0.444   0.70 1  0.286 

  0.30  5.56    0.70  7.14 
0.1
 1.67  5.00  6.67
 
E  aT

2

 E  aT 2 S  Prob S  E  aT 2 NS  Prob  NS
 
 

2
 0.30 Var aT S  E  aT S 





0.70 Var aT NS  E aT NS

2

2
2
 0.30 8.818   5.56    0.70 8.503   7.14  




11.919 + 41.638 = 53.557
Var  aT   53.557   6.67   9.1
2
MLC‐09‐11
7
Alternatively, here is a solution based on aT 
1  vT

1 v 
Var aT  Var   
  
T
 
  vT 
 Var 
 since Var  X  constant   Var  X 
  

  since Var  constant  X   constant
Var vT

2

2
Ax   Ax 
2
2
 Var  X 
2
which is Bowers formula 5.2.9
 
This could be transformed into 2Ax   2 Var aT  Ax2 , which we will use to get
2
Ax NS and 2AxS .
Ax  E  v 2T 
2
 E  v 2T NS  Prob  NS  E  v 2T S  Prob  S
2
  2 Var aT NS  Ax NS   Prob  NS


2
  2Var aT S  AxS   Prob  S


  0.01 8.503  0.2862   0.70
  0.01 8.818   0.4442   0.30
  0.16683 0.70    0.28532  0.30 

 

  

 0.20238
Ax  E  vT 
 E  vT NS  Prob  NS  E  vT S  Prob  S
  0.286  0.70    0.444  0.30 
 0.3334
MLC‐09‐11
8
Ax   Ax 
2
 
Var aT 
2
2
0.20238  0.33342

 9.12
0.01
Question #12 - Removed
Question #13
Answer: D
Let NS denote non-smokers, S denote smokers.
Prob T  t   Prob T  t NS  Prob  NS  P rob T  t S  P rob  S 




 1  e0.1t  0.7  1  e0.2t  0.3
 1  0.7e0.1t  0.3 e0.2t
S0 (t )  0.3e0.2 t  0.7e0.1t
Want tˆ such that 0.75  1  S0  tˆ  or 0.25  S0  tˆ 

ˆ
ˆ

ˆ 2
0.25  0.3e2t  0.7e 0.1t  0.3 e 0.1t
 0.7e 0.1t
ˆ
Substitute: let x  e0.1t
0.3 x 2  0.7 x  0.25  0
ˆ
This is quadratic, so x 
0.7  0.49   0.3 0.25  4
2  0.3
x  0.3147
e 0.1t  0.3147
ˆ
MLC‐09‐11
so tˆ  11.56
9
Question #14
Answer: A
At a constant force of mortality, the benefit premium equals the force of
mortality and so   0.03 .

0.03
2
Ax  0.20 

2   2  0.03
   0.06
Var  0 L  
where A 
2
Ax   Ax 
 a 2

 

2

0.20   13 
 0.06
0.09 
0.03 1

0.09 3
2
2
a
 0.20
1
1

   0.09
Question #15 - Removed
Question #16
Answer: A
1000 P40 
A40 161.32

 10.89
a40 14.8166
 a 
 11.1454 
1000 20V40  1000  1  60   1000  1 
  247.78
 14.8166 
 a40 
 20V  5000 P40  (1  i)  5000q60
21V 
P60

 247.78  (5)(10.89)   1.06  5000  0.01376   255
1  0.01376
[Note: For this insurance, 20V  1000 20V40 because retrospectively, this is identical
to whole life]
Though it would have taken much longer, you can do this as a prospective
reserve. The prospective solution is included for educational purposes, not to
suggest it would be suitable under exam time constraints.
1000 P40  10.89 as above
1
1000 A40  4000 20 E40 A60:5
 1000 P40  5000 P40  20 E40 a60:5  
MLC‐09‐11
10
20 E40  5 E60
a65
1
where A60:5
 A60  5 E60 A65  0.06674
a40:20  a40  20 E40 a60  11.7612
a60:5  a60  5 E60 a65  4.3407
1000  0.16132    4000  0.27414  0.06674  
 10.89 11.7612    5 10.89  0.27414  4.3407     0.27414  0.68756  9.8969 
161.32  73.18  128.08  64.79
1.86544
 22.32

Having struggled to solve for  , you could calculate
above)
calculate 21V recursively.
20V
20 V
prospectively then (as
1
 4000 A60:5
 1000 A60  5000 P40 a60:5   5 E60 a65
  4000  0.06674   369.13   5000  0.01089  4.3407    22.32  0.68756  9.8969 
 247.86 (minor rounding difference from 1000 20V40 )
Or we can continue to
21V
21V
prospectively
1
 5000 A61:4
 1000 4 E61 A65  5000 P40 a61:4   4 E61 a65
where
4 E61

l65 4  7,533,964 
v 
  0.79209   0.73898
l61
 8,075, 403 
1
A61:4
 A61  4 E61 A65  0.38279  0.73898  0.43980
a61:4
 0.05779
 a61  4 E61 a65  10.9041  0.73898  9.8969
 3.5905
21V
  5000  0.05779   1000  0.73898  0.43980 
  5 10.89  3.5905   22.32  0.73898  9.8969 
 255
Finally. A moral victory. Under exam conditions since prospective benefit
reserves must equal retrospective benefit reserves, calculate whichever is simpler.
MLC‐09‐11
11
Question #17
Answer: C
Var  Z   2 A41   A41 
2
A41  A40  0.00822  A41  (vq40  vp40 A41 )
 A41  (0.0028 /1.05   0.9972 /1.05  A41 )
 A41  0.21650
2

A41  2 A40  0.00433  2 A41  v 2 q40  v 2 p40 2 A41


 2 A41  (0.0028 /1.052  0.9972 /1.052
2
A41  0.07193
Var  Z   0.07193  0.216502
 0.02544
Question #18 - Removed
Question #19 - Removed
MLC‐09‐11
12

2
A41 )
Question #20
Answer: D
 x    x1t   x 2t
 0.2 xt   x 2t
  x 2t  0.8 xt
'1
qx 
k
3
 1
'1
px 
1
 1 e
  0.2 k t 2 dt
0
 1 e
0.2
k
3
 0.04
 ln 1  0.04  /  0.2   0.2041
k  0.6123
 2
2 qx

2
2

px   x  dt  0.8
2
0 t
0



 0.8 2 qx   0.8 1  2 px 


px   x   t  dt

   x t  d t
2
 
2
t
px  e
0
2
e

 k t2 d t
0
8 k
e 3
 8   0.6123
3
e

 0.19538
 2
2 qx
 0.8 1  0.19538   0.644
MLC‐09‐11
13
Question #21
Answer: A
k
min(k ,3)
f(k)
f  k    min(k ,3) 
f  k    min  k ,3 
0
1
2
3+
0
1
2
3
0.1
(0.9)(0.2) = 0.18
(0.72)(0.3) = 0.216
1-0.1-0.18-0.216 =
0.504
0
0.18
0.432
1.512
0
0.18
0.864
4.536
2.124
5.580
E  min( K ,3)   2.124

E  min  K ,3 
2
  5.580
Var  min( K ,3)   5.580  2.1242  1.07
Note that E  min( K ,3)  is the temporary curtate life expectancy, ex:3 if the life is
age x.
Question #22
Answer: B
 0.1 60
 0.08 60
e    e   
S0 (60) 
2
 0.005354
 0.1 61
 0.08 61
e     e   
S0 (60) 
2
 0.00492
0.00492
q60  1 
 0.081
0.005354
MLC‐09‐11
14
2
Question #23
Answer: D
Let q64 for Michel equal the standard q64 plus c. We need to solve for c.
Recursion formula for a standard insurance:
20V45
  19V45  P45  1.03  q64 1  20V45 
Recursion formula for Michel’s insurance
20V45
  19V45  P45  0.01 1.03   q64  c  (1  20V45 )
The values of
19 V45
and
20V45
are the same in the two equations because we are
told
Michel’s benefit reserves are the same as for a standard insurance.
Subtract the second equation from the first to get:
0   1.03 (0.01)  c(1  20V45 )
c
(1.03)  0.01
1  20V45 
0.0103
1  0.427
 0.018

MLC‐09‐11
15
Question #24
Answer: B
K is the curtate future lifetime for one insured.
L is the loss random variable for one insurance.
LAGG is the aggregate loss random variables for the individual insurances.
 AGG is the standard deviation of LAGG .
M is the number of policies.
 
L  v K 1   aK 1   1   v K 1  
d
 d
1  Ax 
E  L    Ax   ax   Ax  
d
 0.75095 
 0.24905  0.025 
  0.082618
 0.056604 
 
Var  L    1  
 d
2

2
Ax 
Ax2

2

E  LAGG   M E  L   0.082618M
Var  LAGG   M Var  L   M (0.068034)   AGG  0.260833 M
L
 E  LAGG   E  LAGG  

Pr  LAGG  0   AGG

 AGG
 AGG 


0.082618M 
 Pr  N (0,1) 


M  0.260833 

0.082618 M
0.260833
 M  26.97
 1.645 
 minimum number needed = 27
MLC‐09‐11

0.025 
2

 1 
 0.09476   0.24905   0.068034
 0.056604 
16
Question #25
Answer: D
1  v K 1
for K  0,1, 2,...
d
Z 2  Bv K 1
for K  0,1, 2,...
Z1  12,000
Annuity benefit:
Death benefit:
1  v K 1
 Bv K 1
d
12,000 
12,000  K 1

B
v
d
d 

Z  Z1  Z 2  12,000
New benefit:
2


12,000 

K 1
Var( Z )   B 
 Var v
d


12,000
 150,000 .
Var  Z   0 if B 
0.08
In the first formula for Var  Z  , we used the formula, valid for any constants a and
b and random variable X,
Var  a  bX   b 2Var  X 
Question #26
Answer: A
 x t: y t   x t   y t  0.08  0.04  0.12
Ax   x t /   x t     0.5714


Ay   y t /  y t    0.4


Axy   x t: y t /  x t: y t    0.6667


axy  1/  x t: y t    5.556
Axy  Ax  Ay  Axy  0.5714  0.4  0.6667  0.3047
Premium = 0.304762/5.556 = 0.0549
MLC‐09‐11
17
Question #27
Answer: B
P40  A40 / a40  0.16132 /14.8166  0.0108878
P42  A42 / a42  0.17636 /14.5510  0.0121201
a45  a45  1  13.1121
E  3 L K 42  3  1000 A45  1000 P40  1000 P42 a45
 201.20  10.89  12.12 13.1121
 31.39
Many similar formulas would work equally well. One possibility would be
1000 3V42  1000 P42  1000 P40  , because prospectively after duration 3, this differs
from the normal benefit reserve in that in the next year you collect 1000P40 instead
of 1000 P42 .
Question #28
Answer: E
E  min T ,40    40  0.005  40   32
2
32   t f  t  dt   40 f  t  dt
w
40
0
40
  t f  t  dt   t f  t  dt  40 .6 
w
w
0
40
 86   tf  t  dt
w
40
 tf  t dt  54
  t  40  f  t  dt  54  40 .6   50
e 
w
40
w

40
40
MLC‐09‐11
s  40 
.6
18
Question #29
Answer: B
d  0.05  v  0.95
Step 1 Determine px from Kevin’s work:
608  350vpx  1000vqx  1000v 2 px  px 1  qx 1 
608  350  0.95  px  1000  0.95  1  px   1000  0.9025  px 1
608  332.5 px  950 1  px   902.5 px
px  342 / 380  0.9
Step 2 Calculate 1000 Px:2 , as Kira did:
608  350  0.95  0.9   1000 Px:2 1   0.95  0.9  
 299.25  608  489.08
1000 Px:2 
1.855
The first line of Kira’s solution is that the expected present value of Kevin’s benefit
premiums is equal to the expected present value of Kira’s, since each must equal
the expected present value of benefits. The expected present value of benefits
would also have been easy to calculate as
1000  0.95 0.1  1000  0.952  0.9   907.25


Question #30
Answer: E
Because no premiums are paid after year 10 for (x), 11Vx  Ax 11
One of the recursive reserve formulas is
10V

h 1V

 hV   h  1  i   bh1qx h
 32,535  2,078  1.05  100,000  0.011  35,635.642
px  h
0.989
 35,635.642  0   1.05  100,000  0.012  36,657.31  A
11V 
x 11
0.988
MLC‐09‐11
19
Question #31
Answer: B
t 

The survival function is S0 (t )   1   :
 
Then,
x
t 


ex 
and t px   1 

2
  x
105  45

 30
e45 
2
105  65
 20
e65 
2

e 45:65  

40
0
t
p45:65dt  
40 60  t
0
FG
H
60

40  t
dt
40
60  40 2 1 3
1
60  40  t 
t  t
2
3
60  40
IJ
K
40
0
 1556
.




e 45:65  e 45  e 65  e 45:65
 30  20  1556
.  34

In the integral for e45:65 , the upper limit is 40 since 65 (and thus the joint status
also)
can survive a maximum of 40 years.
Question #32
Answer: E
4   S0 (4) / S0 (4)

d
  e4 / 100
i
1  e4 / 100

e4 / 100
1  e4 / 100

e4
 1.202553
100  e4
MLC‐09‐11
20
Question # 33
Answer: A
L ln px big OP  qb g LM ln e  OP
q xbi g  q xb g M
M ln p b g P x M ln e-b g P
bi g
N
 q xb g 
Q
x
N

Q
 bi g
 b g
 x b g   x b1g   x b 2 g   x b 3g  15
.
q xb g  1  e   b g  1  e 1.5
=0.7769
q xb 2 g 
b0.7769gb g  b0.5gb0.7769g
2
 b g
15
.
 0.2590
Question # 34
Answer: D
22
A 60  v 3 
B
B
 q 60  2

B
pay at end
of year 3
live
then die
2 years in year 3
v4
3p 60

pay at end
of year 4

2 p 60
1
1.03
3
live
3 years

q60 3
then die
in year 4
1  0.09  1  0.11  0.13 
1
1.03
4
1  0.09  1  0.11 1  0.13  0.15 
 0.19
MLC‐09‐11
21
Question # 35
Answer: B
a x  a x:5 5 E x a x 5
a x:5
5 Ex
1  e 0.07b5g

 4.219 , where 0.07     for t  5
0.07
 e 0.07b5g  0.705
a x 5 
1
 12.5 , where 0.08     for t  5
0.08
b
gb g
 a x  4.219  0.705 12.5  13.03
Question #36
Answer: D

1
2
px   p ' x  p ' x   0.8  0.7   0.56
1
qx
 
 
 ln p ' 1 
x
 q  since UDD in double decrement table




 ln p
 x
x


 ln  0.8  

 0.44
ln
0.56




 0.1693

0.3 q x  0.1 
1
0.3qx 
1
 0.053

1  0.1qx 
To elaborate on the last step:
 Number dying from cause 


1 between x  0.1 and x  0.4 
1

0.3 q x  0.1 
Number alive at x  0.1
Since UDD in double decrement,


1
l x   0.3 qx 



lx  1  0.1qx 
MLC‐09‐11

22
Question #37
Answer: E
The benefit premium is
oL
1
1
    0.04  0.04333
ax
12
 v T  (0.04333  0.0066)aT  0.02  0.003aT
 1 vT 
 v  0.04693 
  0.02
  
 0.04693  0.04693
 v T 1 
 0.02





T
2
 
 0.04693 
Var  o L   Var v T 1 
  0.1(4.7230)  0.4723



Question #38 - Removed
Question # 39 - Removed
Question # 40
Answer: D
Use Mod to designate values unique to this insured.
b
g
b
g b gb g
 1000b0.36933 / 111418
.
.
g  3315
a60  1  A60 / d  1  0.36933 / 0.06 / 106
.
 111418
.
1000 P60  1000 A60 / a60
d
i
Mod
Mod
 p60
A60Mod  v q60
A61 
d
i
b
gb
g
1
.
01376
 0.8624 0.383  0.44141
.
106
b
g
a Mod  1  A60Mod / d  1  0.44141 / 0.06 / 106
.  9.8684
d
Mod
E 0 LMod  1000 A60Mod  P60a60
i
b
 1000 0.44141  0.03315 9.8684
g
 114.27
MLC‐09‐11
23
Question # 41
Answer: D
The prospective reserve at age 60 per 1 of insurance is A60 , since there will be no
future premiums. Equating that to the retrospective reserve per 1 of coverage, we
have:
s40:10
A60  P40
 P50Mod s50:10  20 k40
10 E50
a40:10
A
A60  40 
a40
10 E40 10 E50

P50Mod
a50:10
10 E50

1
A40
:20
20 E40
016132
.
7.70
7.57
0.06

 P50Mod

14.8166 0.53667 0.51081
0.51081 0.27414
0.36913 
b
gb
g
0.36913  0.30582  14.8196 P50Mod  0.21887
1000 P50Mod  19.04
Alternatively, you could equate the retrospective and prospective reserves at age
50. Your equation would be:
A50 
P50Mod
a50:10
1
A40 a40:10 A40:10



a40 10 E40 10 E40
1
where A40
 A40 10 E40 A50
:10
b
gb
g
 016132
.
 0.53667 0.24905
 0.02766
d
.
7.70
0.02766


ib g 14016132
.8166 0.53667 0.53667
.
1000
014437
b gb
g  19.07

0.24905  P50Mod 7.57 
1000 P50Mod
MLC‐09‐11
7.57
24
Alternatively, you could set the expected present value of benefits at age 40 to the
expected present value of benefit premiums. The change at age 50 did not
change the benefits, only the pattern of paying for them.
A40  P40 a40:10  P50Mod
016132
.

10 E40
a50:10
.
FG 016132
IJ b7.70g  d P ib0.53667gb7.57g
H 14.8166K
b1000gb0.07748g  19.07

Mod
50
1000 P50Mod
4.0626
Question # 42
Answer: A
d xb 2 g  q xb 2 g  lxb g  400
b g
d xb1g  0.45 400  180
q x b 2 g 
d xb 2 g
400

 0.488
l b g  d b1g 1000  180
x
x
pxb 2 g  1  0.488  0.512
Note: The UDD assumption was not critical except to have all deaths during the
year so that 1000 - 180 lives are subject to decrement 2.
MLC‐09‐11
25
Question #43
Answer: D
Use “age” subscripts for years completed in program. E.g., p0 applies to a person
newly hired (“age” 0).
Let decrement 1 = fail, 2 = resign, 3 = other.
Then q0b1g  1 4 , q1 b1g  15 , q2b1g  1 3
q0b 2 g 
1
q b 3g  1
5,
q1b 2 g 
3,
q b3g  1
10 ,
0
1
1
b
9,
gb
q2b 2 g 
1
8
q b 3g  1
2
gb
4
g
This gives p0b g  1  1 / 4 1  1 / 5 1  1 / 10  0.54
p1b g  b1  1 / 5gb1  1 / 3gb1  1 / 9g  0.474
p2b g  b1  1 / 3gb1  1 / 8gb1  1 / 4g  0.438
So 1b0 g  200, 11b g  200 b0.54g  108 , and 1b2 g  108 b0.474g  512
.
q b1g  log pb1g / log pb g q b g
2
2
2
2
c h / logb0.438g 1  0.438
 b0.405 / 0.826gb0.562g
q2b1g  log
2
3
 0.276
d2b1g  l2b g q2b1g
 512
. 0.276  14
b gb
g
Question #44 - Removed
MLC‐09‐11
26
Question #45
Answer: E

ex 
For the given life table function:
x
2
1
k qx 
x
  x 1

Ax 
k b
1   x 1 k 1
v
  x k b
a  x
Ax 
ax 
v k 1 k qx 
x
1  Ax
d

e50  25    100 for typical annuitants

e y  15  y  Assumed age = 70
A70 
a30
 0.45883
30
a70  9.5607
500000  b a70  b  52, 297
Question #46
Answer: B
10 E30:40  10 p30 10
d p v id p v ib1  i g
 b E gb E gb1  i g
 b0.54733gb0.53667 gb179085
.
g
p40 v10 
10
10
30
10
10
10
40
10
10
30
10
40
 0.52604
The above is only one of many possible ways to evaluate
which should give 0.52604
a30:40:10  a30:40 10 E30:40 a3010:4010
b
g b
gb
g
 b13.2068g  b0.52604gb114784
.
g
 a30:40  1  0.52604 a40:50  1
 7.1687
MLC‐09‐11
27
10
p30
10
p40 v10 , all of
Question #47
Answer: A
Equivalence Principle, where  is annual benefit premium, gives
b g
d
1000 A35  IA

d
35
i
   ax
1000 A35
1000  0.42898

(1199143
.
.
)
 616761
a35  IA 35
b gi
428.98
582382
.
 73.66

We obtained a35 from
a35 
1  A35 1  0.42898

 1199143
.
d
0.047619
Question #48 - Removed
Question #49
Answer: C
 xy   x   y  014
.

0.07
Ax  Ay 

 0.5833
   0.07  0.05
 xy
014
.
014
.
1
1
Axy 


 0.7368 and a xy 

 5.2632
.  0.05 019
.
.  0.05
 xy   014
 xy   014
P
Axy
a xy

Ax  Ay  Axy
MLC‐09‐11
a xy

b
g
2 0.5833  0.7368
 0.0817
5.2632
28
Question #50
Answer: E
 20V  P20 1  i   q40 1  21V  
V
21
b0.49  0.01gb1  ig  0.022b1  0.545g  0.545
b1  ig  b0.545gb1  0.022g  0.022
0.50
 111
.
 21V  P20 1  i   q41 1  22V   22V
. g  q b1  0.605g  0.605
b0.545.01gb111
41
q41 
0.61605  0.605
0.395
 0.028
Question #51
Answer: E
1000 P60  1000 A60 / a60
b
gb
g
 1000bq  p A g / b106
.  p a g
 c15  b0.985gb382.79gh / c106
.  b0.985gb10.9041gh  33.22
 1000 v q60  p60 A61 / 1  p60 v a61
60
60
61
60
61
Question #52 - Removed
MLC‐09‐11
29
Question #53
Answer: E
g   ln(0.96)  0.04082
 x02t: y t  0.04082  0.01  0.03082
h   ln(0.97)  0.03046
 x01t: y t  0.03046  0.01  0.02046
5


5
pxy  5 pxy00  exp    x01t: y t   x02t: y t   x03t: y t dt  e 5(0.06128)  0.736
0
Question #54 - Removed
Question #55
Answer: B
lx    x  105  x
 t p45  l45t / l45  (60  t ) / 60
Let K be the curtate future lifetime of (45). Then the sum of the payments is 0 if
K  19 and is K – 19 if K  20 .
F 60  K IJ  1
60 K
b40  39...1g  b40gb41g  13.66

60
2b60g

20 a45 
 1  GH
60
K  20
Hence,
c
h
c
Prob K  19  13.66  Prob K  32.66
h
b g
 ProbbT  33g
 Prob K  33 since K is an integer
 33p45 
l78 27

l45 60
 0.450
MLC‐09‐11
30
Question #56
Answer: C
Ax 
2
Ax 
d IAi
z
E
0s x
zd

0
 0.4
 
x
 0.25    0.04
  2





z

Ax ds
0 s
Ax ds
ib g
e 0.1s 0.4 ds
F e I
 b0.4 gG
H 01. JK
0.1s


0
0.4
4
01
.
Alternatively, using a more fundamental formula but requiring more difficult
integration.
c IA h
x


z
z

0

0
bg
b0.04g e
t t px  x t e   t dt
t e 0.04 t
 0.04
z

0
0.06 t
dt
t e 0.1t dt
(integration by parts, not shown)

t
1
 0.04

e 0.1 t
0
01
. 0.01
0.04

4
0.01
FG
H
MLC‐09‐11
IJ
K
31
Question #57
Answer: E
Subscripts A and B here distinguish between the tools and do not represent ages.

We have to find e AB

eA 

eB 

FG 1  t IJ dt  t  t
H 10K
20
z
z FGH
z FGH
10
0
IJ
K
t
t2
1  dt  t 
7
14
7
0
7
e AB 
2 10

1
t
7
7
0
 49 
0
49
 35
.
14
IJ FG 1  t IJ dt  z FG 1  t  t  t IJ dt
K H 10K
H 10 7 70K
2
7
0
t2 t2
t3
t  
20 14 210
7
0
 7
49 49 343


 2.683
20 14 210



 10  5  5

e AB  e A  e B  e AB
 5  35
.  2.683  5817
.
Question #58
Answer: A
 xt  0.100  0.004  0.104
t
pxb g  e 0.104 t
Expected present value (EPV) = EPV for cause 1 + EPV for cause 2.
z
5
b
z
g
b
5
g
2000 e 0.04 t e 0.104 t 0100
.
dt  500,000 e 0.04 t e 0.104 t 0.400 dt
0
0
  2000  0.10   500, 000  0.004    e 0.144t dt 
5
0
MLC‐09‐11
32


2200
1  e 0.144 5  7841
0.144
Question #59
Answer: A
R  1  px  q x
S  1  px  e
k 
1
1
1
1
e 0
  xt dt   k dt
  xt  k  dt
0
since e 0
 e 0

 e 0
1
  xt dt  k dt
So S  0.75R  1  px  e  k  0.75q x
1  0.75q x
px
px
1  qx
ek 

1  0.75q x 1  0.75q x
e k 
k  ln
LM 1  q OP
N1  0.75q Q
x
x
MLC‐09‐11
33
Question #60
Answer: C
A60  0.36913
2
d  0.05660
A60  0.17741
and
2
2
A60  A60
 0.202862



Expected Loss on one policy is E  L     100,000   A60 
d
d



2
Variance on one policy is Var  L     100,000   2 A60  A60
d

On the 10000 lives,
E  S   10,000 E  L    and Var  S   10,000 Var  L   
2


The  is such that 0  E  S  / Var  S   2.326 since   2.326   0.99
 
 
10,000   100,000   A60 
d
d 
  2.326



2
100 100,000   2 A60  A60
d

 
 
100   100,000     0.36913
d 
d 
 2.326


100,000    0.202862 
d

0.63087

d
 36913
100,000 
0.63087


 0.004719
d
 36913  471.9  0.004719
d

36913  471.9

d 0.63087  0.004719
 59706
  59706  d  3379
MLC‐09‐11

d
34
Question #61
Answer: C
  0V    1  i   1000  1V  1V   q75
1V
 1.05  1000q75
Similarly,
2 V   1V     1.05  1000q76
3V
  2V     1.05  1000q77


1000 3V  1.053  1.052    1.05  1000  q75  1.052  1000 1.05  q76  1000  q77 *




1000  1000 1.052 q75  1.05q76  q77
1.05  1.05
3

2

 1.05
1000 x 1  1.052  0.05169  1.05  0.05647  0.06168

3.310125
1000  1.17796
 355.87
3.310125
* This equation is an algebraic manipulation of the three equations in three
unknowns  1V , 2V ,   . One method – usually effective in problems where benefit
= stated amount plus reserve, is to multiply the 1V equation by 1.052 , the 2V
equation by 1.05, and add those two to the 3V equation: in the result, you can
cancel out the 1V , and 2V terms. Or you can substitute the 1V equation into the
2 V equation, giving 2 V in terms of  , and then substitute that into the 3V
equation.
Question #62
Answer: D
A281:2 
z
3V
d
i
FG IJ
H K
b g
1
.
 0.05827
1  e 2  0.02622 since   ln 106
72
71
 1 v
 19303
.
72

a28:2
2  t
e 1 72 dt
0
 500,000 A281:2  6643 a28:2
= 287
MLC‐09‐11
35
Question #63
Answer: D
Let Ax and a x be calculated with  x t and   0.06
Let Ax* and a x * be the corresponding values with  x t
increased by 0.03 and  decreased by 0.03
ax 
1  Ax


0.4
 6.667
0.06
ax  ax
*


    xs  0.03 ds 0.03t
*
0
e
dt
 Proof: ax  0 e

t


0
e 
t
  xs ds 0.03t 0.03t
0
e
e
t

 e
0
  x s ds
0
e 0.06 t dt
 ax 
Ax*  1  0.03 a x *  1  0.03 a x
b gb
 1  0.03 6.667
g
 0.8
MLC‐09‐11
36
dt
Question #64
Answer: A
bulb ages
Year
0
1
0
1
2
3
10000
0
1000
9000
100+2700
900
280+270+3150
2
3
0
0
6300
0
0
0
The diagonals represent bulbs that don’t burn out.
E.g., of the initial 10,000, (10,000) (1-0.1) = 9000 reach year 1.
(9000) (1-0.3) = 6300 of those reach year 2.
Replacement bulbs are new, so they start at age 0.
At the end of year 1, that’s (10,000) (0.1) = 1000
At the end of 2, it’s (9000) (0.3) + (1000) (0.1) = 2700 + 100
At the end of 3, it’s (2800) (0.1) + (900) (0.3) + (6300) (0.5) = 3700
1000 2800 3700


105
.
105
. 2 105
. 3
 6688
Expected present value 
Question #65
Answer: E

e25:25 

z
z
15
0 t
p25dt 15 p25
15 .04 t
0
e
d
z
10
0t
FG z IJ e
H
Kz
i  e LMN.051 d1  e
dt  e

15
0
.04 ds
1
.60
1  e.60
.04
.
 112797
 4.3187
 15.60

MLC‐09‐11
p40 dt
10 .05t
0
dt
.50
iOPQ
37
#
replaced
1000
2800
3700
Question #66
Answer: C
5
p 60 1 
e1  q je1  q jb1  q gb1  q gb1  q g
 b0.89gb0.87gb0.85gb0.84gb0.83g
60 1
60  2
63
64
65
 0.4589
Question # 67
Answer: E
1
     0.08      0.04
 
12.50  a x 
Ax 

 0.5
 
1

2
Ax 

  2 3
e j
Var aT 
2
Ax  Ax2
2
1

1
 3 4  52.083
0.0016
S.D.  52.083  7.217
MLC‐09‐11
38
Question # 68
Answer: D
v  0.90  d  010
.
Ax  1  dax  1  010
. 5  0.5
b gb g
Benefit premium  

5000 Ax  5000vqx
ax
b5000gb0.5g  5000b0.90gb0.05g  455
5
10th benefit reserve for fully discrete whole life  1 
0.2  1 
ax 10
ax
ax 10
 ax 10  4
5
b gb g
  a
 b5000gb0.6g  b455gb4g  1180
Ax 10  1  dax 10  1  010
.
4  0.6
10V
 5000 Ax 10
x 10
Question #69
Answer: D
v is the lowest premium to ensure a zero % chance of loss in year 1 (The present
value of the payment upon death is v, so you must collect at least v to avoid a loss
should death occur).
Thus v = 0.95.
2
E Z  vqx  v 2 px qx 1  0.95  0.25  0.95  0.75  0.2
bg
d i
b g
 0.3729
b g
b g
2
4
E Z2  v 2qx  v 4 px qx 1  0.95  0.25  0.95  0.75  0.2
 0.3478
b g d i c b gh
Var Z  E Z2  E Z
MLC‐09‐11
2
b
g
2
 0.3478  0.3729  0.21
39
Question #70
Answer: D
Expected present value (EPV) of future benefits =
  0.005  2000  0.04 1000  /1.06  1  0.005  0.04  0.008  2000  0.06 1000  /1.062
 47.17  64.60
 111.77
EPV of future premiums  1  1  0.005  0.04  /1.06  50
 1.9009  50 
 95.05
E  1 L K55  1  111.77  95.05  16.72
Question #71 - Removed
Question #72
Answer: A
Let Z be the present value random variable for one life.
Let S be the present value random variable for the 100 lives.
bg
E Z  10
 10
z
 t  t
e e  dt
5

 
e  b   g 5
 2.426
FG  IJ e b g
H 2   K
F 0.04IJ de i  11233
 10 G
.
H 0.16K
Var b Z g  E d Z i  c E b Z gh
d i
 2   5
E Z 2  102
0.8
2
2
2
 11233
 2.4262
.
 5.348
bg
bg
VarbSg  100 Varb Zg  534.8
E S  100 E Z  242.6
F  242.6
.
 1645
 F  281
534.8
MLC‐09‐11
40
Question #73
Answer: D
Prob{only 1 survives} = 1-Prob{both survive}-Prob{neither survives}
b
ge
 1 3p50  3p 50  13p50 1 3p 50
b
gb
gb
gb
j
gb
gb
g b
gb
 1  0.9713 0.9698 0.9682 0.9849 0.9819 0.9682  1  0.912012 1  0.93632
 
 0.912012
g
0.936320
 0.140461
Question # 74 - Removed
Question #75 - Removed
Question # 76
Answer: C
This solution applies the equivalence principle to each life. Applying the
equivalence principle to the 100 life group just multiplies both sides of the first
equation by 100, producing the same result for P.
EPV  Prems   P  EPV  Benefits   10q70 v  10 p70 q71v 2  Pp70 p71v 2
P
b10gb0.03318g  b10gb1  0.03318gb0.03626g  Pb1  0.03318gb1  0.03626g
.
108
. 2
108
 0.3072  0.3006  0.7988 P
0.6078
P
 3.02
0.2012
(EPV above means Expected Present Value).
MLC‐09‐11
41
. 2
108
Question #77
Answer: E
Level benefit premiums can be split into two pieces: one piece to provide
term insurance for n years; one to fund the reserve for those who survive.
Then,
Px  Px1:n  Px:n1 nV
And plug in to get
b
gb
g
0.090  Px1:n  0.00864 0.563
Px1:n  0.0851
Another approach is to think in terms of retrospective reserves. Here is one such
solution:


V  Px  Px1:n 
sx:n
n

 Px  Px1:n
 aE
x:n
n

P
P  P 

P 
 Px  Px1:n
x
ax:n
1
x:n
ax:n
1
x
x:n
1
x:n
e
j
0.563  0.090  Px1:n / 0.00864
b
gb
g
Px1:n  0.090  0.00864 0.563
 0.0851
MLC‐09‐11
42
Question #78
Answer: A
b g
  ln 1.05  0.04879
Ax  
x
t
0

x
0

px  x t e  t dt
1  t
e dt for the given mortality function
x
1
a
  x x
From here, many formulas for the reserve could be used. One approach is:
Since
A50 
a50
50
 1  A50 
18.71
 0.3742 so a50  
  12.83
50
  

 1  A40 
19.40
 0.3233 so a40  
  13.87
60
60
  
0.3233
P  A40  
 0.02331
13.87
reserve   A50  P  A40  a50    0.3742   0.0233112.83   0.0751.
A40 
a60

Question #79
Answer: D
Ax  E vTx   E vTx NS   Prob  NS  E  vTx S   Prob  S
0.03 
0.6




  0.70  
  0.30
 0.03  0.08 
 0.06  0.08 
 0.3195
Similarly, 2 Ax 
F
H
Var aT
I
b gK 
x
MLC‐09‐11
2
FG 0.03 IJ  0.70  FG 0.06 IJ  0.30  01923
.
.
H 0.03  0.16K
H 0.06  0.16K
Ax  Ax2
2

 0.31952
01923
.
 141
..
0.082
43
Question #80
Answer: B
2
q80:84  2 q80  2 q84  2 q80:84
 0.5  0.4  1  0.6   0.2  0.15  1  0.1
= 0.10136
Using new p82 value of 0.3
0.5  0.4  1  0.3  0.2  0.15  1  0.1
= 0.16118
Change = 0.16118 – 0.10136 = 0.06
Alternatively,
2 p80  0.5  0.4  0.20
3 p80  2 p80  0.6  0.12
2 p84  0.20  0.15  0.03
3 p84  2 p84  0.10  0.003
2 p80:84  2 p80  2 p84  2 p80 2 p84 since independent
3
p80:84
 0.20  0.03   0.20  0.03  0.224
 3 p80  3 p84  3 p80 3 p84
 0.12  0.003   0.12  0.003  0.12264
2 q 80:84  2 p80:84  3 p80:84
 0.224  0.12264  0.10136
Revised
3 p80  0.20  0.30  0.06
3
p 80:84  0.06  0.003   0.06  0.003
 0.06282
2 q 80:84  0.224  0.06282  0.16118
change  0.16118  0.10136  0.06
Question #81 - Removed
MLC‐09‐11
44
Question #82
Answer: A
5
b g  pb1g pb2g
p50
5 50 5 50
FG 100  55IJ e b gb g
H 100  50K
 b0.9gb0.7788g  0.7009
 0.05 5

Similarly
10
FG 100  60IJ e b g b g
H 100  50 K
 b0.8gb0.6065g  0.4852
b g 
p50
 0.05 10
b g  pb g  pb g  0.7009  0.4852
5 5 q50
5 50
10 50
 0.2157
Question #83
Answer: C
Only decrement 1 operates before t = 0.7
b g  b0.7g qb1g  b0.7gb010
. g  0.07
1
0.7 q40
40
Probability of reaching t = 0.7
since UDD
is
1-0.07 = 0.93
Decrement 2 operates only at t = 0.7, eliminating 0.125 of those who reached 0.7
b gb
g
b2g  0.93 0125
q40
.
 011625
.
MLC‐09‐11
45
Question #84
Answer: C
e
j
 1 2 p80v 2  1000 A80 
FG
H
 1
0.83910
1.062
vq80 v 3 2 p80q82

2
2
IJ  665.75  FG 0.08030  0.83910  0.09561IJ
K
. g
2b1.06g
H 2b106
K
3
b
g
b
b167524
.
g  665.75
g
 174680
.
 665.75   0.07156
  397.41
Where 2 p80 
3,284 ,542
 0.83910
3,914 ,365
b
gb
g
Or 2 p80  1  0.08030 1  0.08764  0.83910
Question #85
Answer: E
At issue, expected present value (EPV) of benefits

  bt v t t p65 
0
65 t
dt
  1000  e0.04t  e 0.04t  t p65 65  t  dt

0
 1000 

0
t
p65 65  t  dt  1000  q65  1000
EPV of premiums   a65  
FG 1 IJ  16.667
H 0.04  0.02K
Benefit premium   1000 / 16.667  60
2V


z
z

0

0
b g
b2u v u u p67  65 2  u du   a67
b g b gb
g
1000 e0.04b 2uge 0.04u u p67  65 2  u du  60 16.667
 1000e0.08
z

0 u
b g
p67  65 2  u du  1000
 1083.29  q67  1000  1083.29  1000  83.29
MLC‐09‐11
46
Question #86
Answer: B
(1)
a x:20  ax:20  1 20 Ex
(2)
ax:20 
(3)
Ax:20 
(4)
Ax  A1x:20  20 Ex Ax  20
1  Ax:20
d
A1x:20
 Ax:201
b gb g
0.28  A1x:20  0.25 0.40
A1x:20  018
.
Now plug into (3):
Ax:20  018
.  0.25  0.43
ax:20 
Now plug into (2):
Now plug into (1):
b
1  0.43
.
 1197
0.05 / 105
.
g
a x:20  1197
.  1  0.25  1122
.
Question #87 - Removed
Question #88
Answer: B
ex  px  pxex 1  px 
ex
8.83

 0.95048
1  ex 1 9.29
ax  1  vpx  v 2 2 px  ....
a
x:2
 1  v  v 2 2 p x  ...
ax:2  ax  vqx  5.6459  5.60  0.0459
v 1  0.95048   0.0459
v  0.9269
1
i   1  0.0789
v
MLC‐09‐11
47
Question #89 - Removed
Question #90 – Removed
Question #91
Answer: E
1
1

75  60 15
1
1 3 1
60F 
  
   85
  60 15 5 25
60M 
t
10
t
 1
25
t
M
p65
 1
t
F
p60
Let x denote the male and y denote the female.
e x  5  mean for uniform distribution over  0,10  
e y  12.5  mean for uniform distribution over  0,25  
10 
t 
t 
e xy   1   1   dt
0
 10   25 
10 
7
t2 
  1 
t
 dt
0
 50 250 

 t 

7 2 t3 
t 

100
750 
10
0
 10 
7
1000
 100 
100
750
 10  7 




exy  ex  e y  exy  5 
MLC‐09‐11
4 13

3 3
25 13 30  75  26
 
 1317
.
2
3
6
48
Question #92
Answer: B

1

 3

1
2

Ax 
  2 5
Ax 
c h
P Ax    0.04
F Pc A hI A  A
Var b Lg  G 1 
j
H  JK e
F 0.04 IJ FG 1  FG 1IJ IJ
 G1 
H 0.08 K H 5 H 3K K
F 3I F 4 I
G J G J
H 2 K H 45K
2
x
2
2
x
x
2
2
2

1
5
Question #93
Answer: A
Let  be the benefit premium
Let kV denote the benefit reserve at the end of year k.
For any n,  nV    1  i    q25 n  n 1V  p25 n  n 1V 

Thus 1V   0 V    1  i 
2V
3V
n 1V
  1V   1  i    1  i     1  i    
s2


  2V   1  i    
s2   1  i    
s3
By induction (proof omitted)
sn
n V   
For n  35, n V  a60 (expected present value of future benefits; there are no future
premiums)
a60   
s35

a60

s35
For n  20,
MLC‐09‐11
20V
 a
s20   60
  
 
 s35

s
 
 20

49
Alternatively, as above
 nV    1  i   n1V
Write those equations, for n  0 to n  34
0 :  0V    1  i   1V
1:  1V   1  i   2V
2 :  2V   1  i   3V

34 :  34V    1  i   35V
Multiply equation k by 1  i 
34  k
and sum the results:
 0V    1  i 35   1V   1  i 34   2V   1  i 33     34V    1  i  
34
33
32
1V 1  i   2V 1  i   3V 1  i     34 V 1  i   35V
For k  1, 2, , 34, the k V 1  i 
0V
35 k
terms in both sides cancel, leaving
1  i 35   1  i 35  1  i 34    1  i    35V
Since 0V  0
 s35  35V
 a60
(see above for remainder of solution)
MLC‐09‐11
50
Question #94
Answer: B
 x  t: y  t 
t qy t
t qx
px  x t  t q x t p y  y t
 t p y  t px  t q y  t px  t p y
For (x) = (y) = (50)
50:50 10.5  
where
10.5
p50 
10.5 q50
10
2
 l60  l61   12 8,188,074  8,075, 403  0.90848
l50
8,950,901
 1  10.5 p50  0.09152
p50 
10.5
1
 10.5 q50  10 p50  q60  2
 0.09152  0.91478 0.01376  2   0.0023

2
 10.5 q50  10.5 p50   2   10.5 p50   0.09152  0.90848 2    0.908482
8,188,074
 0.91478
8,950,901
p50   50  10.5    10 p50  q60
since UDD
Alternatively, 10t  p50  10 p50 t p60
10t  p50:50   10 p50 
2
 t p60 
2
10t  p 50:50  2 10 p50 t p60   10 p50 
2
 t p60 
2
 2 10 p50 1  tq60    10 p50  1  tq60  since UDD
2
2
Derivative  2 10 p50 q60  2  10 p50  1  tq60  q60
Derivative at 10  t  10.5 is
2
2  0.91478  0.01376    0.91478  1   0.5  0.01376    0.01376   0.0023
2
10.5
p 50:50  2 10.5 p50   10.5 p50 
2
 2  0.90848    0.90848 
2
 0.99162
 (for any sort of lifetime) 
MLC‐09‐11

dp
dt    0.0023  0.0023
p
0.99162
51
Question #95
Answer: D
 xt   x1t   x 2t  0.01  2.29  2.30

P  P  vt t px   x 2t dt  50, 000  vt t p x   x1t dt  50, 000  vt t px   xt dt
2
2
0
2 0.1t 2.3t
0
P  P e
e
0
2
2 0.1t 2.3t
 2.29dt  50, 000  e
0
e
2
2 2.4
2 2.4
2 2.4


1 e   
1 e  
e  
P 1  2.29 
 2.3 
  50000  0.01

2.4 
2.4
2.4 


P = 11,194
Question #96
Answer: B
ex  px  2 px  3 px  ...  1105
.
b g
Annuity  v 3 3 p x 1000  v 4 4 p x  1000  104
.  ...


. g
1000b104
k 3 k
v
k px
k 3
 1000v 3

 k px
k 3
F 1 IJ
 1000v be  0.99  0.98g  1000G
H 104
. K
3
x
3
 9.08  8072
Let  = benefit premium.
e
j
 1  0.99v  0.98v 2  8072
2.8580  8072
  2824
MLC‐09‐11

 0.01dt  50, 000  e 0.1t e 2.3t  2.3dt
52
Question #97
Answer: B
b g
b ge
1
 a30:10  1000 A30  P IA 30
 10
:10

10
A30
j
1000 A30
b g
a30:10  IA

1
3010
:
 1010 A30
b
g
b
1000 0102
.
7.747  0.078  10 0.088
g
102
6.789
 15.024

Question #98
Answer: E
For the general survival function S0 (t )  1 

FG1  t IJ dt
H   30K
L t OP
 Mt 
N 2b  30g Q
e 30 
z
t

,0t  ,
  30
0
2
  30
0

  30
2

100  30
 35
2
Prior to medical breakthrough
  100  e30 
After medical breakthrough
e  30  e 30  4  39
so

e30
  39 
   30
2


    108
Question #99
Answer: A
L  100, 000v 2.5  4000a3
@5%
= 77,079
MLC‐09‐11
53
Question #100
Answer: D
  accid   0.001
  total   0.01
  other   0.01  0.001  0.009

Expected present value   500,000 e 0.05t e0.01t  0.009  dt
0

10  50,000 e0.04t e0.05t e 0.01t  0.001 dt
0
 0.009 0.001 
 500, 000 

 100, 000
 0.06 0.02 
Question #101 Removed
Question #102
Answer: D
1000 20V  1000 Ax  20 

ax  20 
1000  19V  20 Px 1.06   qx 19 1000 
px 19
 342.03  13.72 1.06   0.01254 1000   369.18
0.98746
1  0.36918
 11.1445
 0.06 /1.06 
so 1000 Px  20  1000
MLC‐09‐11
Ax  20 369.18

 33.1
ax  20 11.1445
54
Question #103
Answer: B
k
 
1
k
 x t dt
 2  xt dt
 e 0
 e 0

 
k px
   x1t dt 
  e 0



k
2
  k px  where k px is from Illustrative Life Table, since    follows I.L.T.
2
10
6,616,155
 0.80802
8,188,074
6,396,609

 0.78121
8,188,074
p60 
11 p60
10
1
b g  p b g  p b g
q60
10 60 11 60

b
10
p60
g b
2
11 p60
g
2
from I.L.T.
 0.80802 2  0.781212  0.0426
Question #104
Answer: C
Ps 
1
 d , where s can stand for any of the statuses under consideration.
a s
as 
1
Ps  d
1
 6.25
.  0.06
01
1
axy 
 8.333
0.06  0.06
ax  ay 
axy  axy  ax  ay
axy  6.25  6.25  8.333  4.167
Pxy 
1
.
 0.06  018
4.167
MLC‐09‐11
55
Question #105
Answer: A
z
b
g
g j  48
d 0b g  1000 e  b   0.04 gt   0.04 dt
1
0
 1000 1  e  b   0.04
e
e  b  0.04 g  0.952
b
  0.04   ln 0.952
g
 0.049
  0.009
z
b
g
d 3b1g  1000 e 0.049 t 0.009 dt
4
3
 1000
0.009  b 0.049 gb 3g  b 0.049 gb 4 g
e
e
 7.6
0.049
e
j
Question #106
Answer: B
This is a graph of lx  x .
b
g
 x would be increasing in the interval 80,100 .
The graphs of lx px , lx and lx2 would be decreasing everywhere.
Question #107
Answer: B
Expected value  v15 15 px
Variance  v30 15 px 15 qx
v30 15 px 15 qx  0.065 v15 15 px
v15 15qx  0.065  15 qx  0.3157
Since  is constant
15 q x
 px 
15

 1   px 
15

 0.6843
px  0.975
qx  0.025
MLC‐09‐11
56
Question #108
Answer: E
1
 2
11V
A
11V
B
1   2 



10V

11V
A
10V
A
B
0
 p
1 i
 B
qx 10
 1000
px 10

x 10
 p
1 i
 11V B 


x 10
10V
qx 10
 1000
px 10
 10V B   B
A
 101.35  8.36 
 p
1 i
x 10
1.06 
1  0.004
 98.97
Question #109
Answer: A
2
EPV (x’s benefits)   v k 1bk 1 k px q x  k
k 0
b g
b gb g
b gb gb g
 1000 300v 0.02  350v 2 0.98 0.04  400v 3 0.98 0.96 0.06
 36,829
Question #110
Answer: E
 denotes benefit premium
V  EPV future benefits - EPV future premiums
1
0.6 
     0.326
108
.
.  q65 10
10V   108
11V 
p65
19
b

gb g b gb g
. g  b010
. gb10g
b5.0  0.326gb108
1  010
.
=5.28
MLC‐09‐11
57
Question #111
Answer: A
Expected present value Benefits 
 0.8 0.110,000    0.8 0.9  0.097  9,000 
1.062
 1, 239.75
1.063
  0.8   0.8  0.9  
1, 239.75  P  1 


1.062 
 1.06
 P  2.3955 
P  517.53  518
Question #112
Answer: A
1180  70a30  50a40  20a30:40
b gb g b gb g
1180  70 12  50 10  20a30:40
a30:40  8
a30:40  a30  a40  a30:40  12  10  8  14
100a30:40  1400
Question #113
Answer: B
z

bg
a  a f t dt 
 t

z
 1  e 0.05t

1
0.05
0.05
zb


te
t
1
te  t dt
2
bg
i
 te 1.05t dt
LM b g FG
IJ
H
K
N
1 L F 1 I O

.
M1  G . JK PP  185941
0.05 MN H 105
Q
t
1
1

 t  1 et 

e 1.05t
2
.
0.05
105
.
105
2
20,000  185941
.
 37,188
MLC‐09‐11
58
OP
Q

0
Question #114
Answer: C
Event
x0
Prob
 0.05
 0.95 0.10   0.095
 0.95 0.90   0.855
x 1
x2
Present Value
15
15  20 /1.06  33.87
15  20 /1.06  25 /1.062  56.12
E  X    0.05 15    0.095  33.87    0.855  56.12   51.95
E  X 2    0.05 15    0.095  33.87    0.855  56.12   2813.01
2
 
2
2
Var  X   E X 2  E  X   2813.01   51.95   114.2
2
2
Question #115
Answer: B
Let K be the curtate future lifetime of (x + k)
kL
 1000v K 1  1000 Px:3  aK 1
When (as given in the problem), (x) dies in the second year from issue, the curtate
future lifetime of  x  1 is 0, so
1L
 1000v  1000 Px:3 a1
1000
 279.21
1.1
 629.88  630

The premium came from
A
Px:3  x:3
ax:3
Ax:3  1  d ax:3
Px:3  279.21 
MLC‐09‐11
1  d ax:3
ax:3

1
d
ax:3
59
Question #116
Answer: D
Let M = the force of mortality of an individual drawn at random; and T  future
lifetime of the individual.
Pr T  1
n
 E Pr T  1 M



z
zz
zd

0
0 0
0
bg
Pr T  1 M   f M  d
2 1
2
s
1
2
e   t dt d
1  e
i 21 du  21 d2  e
2
 0.56767
Question #117
Answer: E
For this model:
1/ 60
1
(1)
40(1)t 

; 40
 20  1/ 40  0.025
1  t / 60 60  t
1/ 40
1
(1)

40(2)t 
; 40
 20  1/ 20  0.05
1  t / 40 40  t
 
40
 20  0.025  0.05  0.075
MLC‐09‐11
i 21 d1  e i
1 
60
2
Question #118
Answer: D
Let   benefit premium
Expected present value of benefits =
 0.03 200,000 v  0.97 0.06 150,000 v 2  0.97 0.94 0.09 100,000 v 3
b gb
g b gb gb
g b gb gb gb
 5660.38  7769.67  6890.08
 20,32013
.
Expected present value of benefit premiums
 ax:3 
b gb g
 1  0.97v  0.97 0.94 v 2 
 2.7266 
20,32013
.
 7452.55
 
2.7266
1V

. g  b200,000gb0.03g
b7452.55gb106
1  0.03
 1958.46
Initial reserve, year 2 = 1V  
= 1958.56 + 7452.55
= 9411.01
Question #119
Answer: A
Let  denote the premium.
b g
L  bT v T   aT  1 i
T
 v T   aT
 1   aT
E L  1   ax  0
 
 L  1   aT  1 
b
g
aT
ax

1
ax
d
 ax  1  v T
i
 ax
v T  1   ax
v T  Ax


 ax
1  Ax
MLC‐09‐11
61
g
Question #120
Answer: D
(0, 1)
(1, 0.9)
(1.5, 0.8775)
(2, 0.885)
tp1
1
2
t
1
p1  (1  01
. )  0.9
2
p1  0.9 1  0.05  0.855
b gb
g
b
g
since uniform, 1.5 p1  0.9  0.855 / 2
 0.8775

e1:1.5  Area between t  0 and t  15
.

FG 1  0.9 IJ b1g  FG 0.9  0.8775IJ b0.5g
H 2 K H 2 K
 0.95  0.444
.
 1394
MLC‐09‐11
62
Alternatively,

e11: .5 


z
z
zb
1.5
0 t
p1dt
1
z
0.5
p dt 1p1 x
0 t 1
0
1
0
g
p2 dx
1  01
. t dt  0.9
 t  0.12t
2
1
0
z
0.5
0
b1  0.05xgdx
 0.9 x  0.052 x
0.5
2
0
.
 0.95  0.444  1394
Question #121
Answer: A
b g
10,000 A63 112
.  5233
A63  0.4672
Ax 1 
A64 
b g
Ax 1  i  qx
px
. g  0.01788
b0.4672gb105
1  0.01788
 0.4813
A65 
. g  0.01952
b0.4813gb105
1  0.01952
 0.4955
Single gross premium at 65 = (1.12) (10,000) (0.4955)
= 5550
b1  ig
2

5550
5233
i
5550
 1  0.02984
5233
Question #122A
Answer: C
Because your original survival function for (x) was correct, you must have
 x t  0.06   x02t: y t   x03t: y t   x02t: y t  0.02
 x02t: y t  0.04
Similarly, for (y)
 y t  0.06   x01t: y t   x03t: y t   x01t: y t  0.02
 x01t: y t  0.04
MLC‐09‐11
63
The first-to-die insurance pays as soon as State 0 is left, regardless of which state
is next. The force of transition from State 0 is
 x01t: y t   x02t: y t   x03t: y t  0.04  0.04  0.02  0.10 .
With a constant force of transition, the expected present value is


0.10
 t
0.05t 0.10 t
00
01
02
03
e
p





dt

(
)






t
xy
x
t
:
y
t
x
t
:
y
t
x
t
:
y
t
0
0 e e (0.10)dt  0.15
Question #122B
Answer: E
Because (x) is to have a constant force of 0.06 regardless of (y)’s status (and vice23
versa) it must be that  13
x  t: y  t   x  t : y  t  0.06 .
There are three mutually exclusive ways in which both will be dead by the end of
year 3:
1: Transition from State 0 directly to State 3 within 3 years. The probability of this
is
3
0.02 0.10t
0.3
0 t p  dt  0 e 0.02dt   0.10 e 0  0.2(1  e )  0.0518
2: Transition from State 0 to State 1 and then to State 3 all within 3 years. The
probability of this is
3

00
xy
3
0
3
03
x  t: y  t
0.10 t
3
t
0.10 t
pxy00  x01t: y t 3t p13
0.04(1  e 0.06(3t ) )dt
x  t : y  t dt   e
0
3
  0.04 e
0
 0.4(1  e
0.10 t
0.3
e
)e
0.18 0.04 t
0.18
e
(1  e
0.04 0.10t 0.04e 0.18 0.04t
  
e

e
0.10
0.04
0.12
3
0
)  0.00922
3: Transition from State 0 to State 2 and then to State 3 all within 3 years. By
symmetry, this probability is 0.00922.
The answer is then 0.0518 + 2(0.00922) = 0.0702.
MLC‐09‐11
64
Question #122C
Answer: D
Because the original survival function continues to hold for the individual lives, with
a constant force of mortality of 0.06 and a constant force of interest of 0.05, the
expected present values of the individual insurances are
Ax  Ay 
0.06
 0.54545 ,
0.06  0.05
Then,
Axy  Ax  Ay  Axy  0.54545  0.54545  0.66667  0.42423
Alternatively, the answer can be obtained be using the three mutually exclusive
outcomes used in the solution to Question 122B.
1:


0

e 0.05t t pxy00  x03t: y t dt   e0.05t e0.10t 0.02dt 
2 and 3:
0


0
0.02
 0.13333
0.15

13
e 0.05t t pxy00  x01t: y t  e 0.05 r r p11
x  t : y  t  x  t  r : y  t  r drdt
0


0
0
  e 0.05t e 0.10t 0.04  e 0.05 r e 0.06 r 0.06drdt 
0.04 0.06
 0.14545
0.15 0.11
The solution is 0.13333 + 2(0.14545) = 0.42423.
The fact that the double integral factors into two components is due to the
memoryless property of the exponential transition distributions.
MLC‐09‐11
65
Question #123
Answer: B
5
q35:45  5 q35  5 q45  5 q35:45
 5 p35q40  5 p45q50  5 p35:45q40:50
b
g
 p q  p q  p  p b1  p p g
 b0.9gb.03g  b0.8gb0.05g  b0.9gb0.8g 1  b0.97gb0.95g
 5 p35q40  5 p45q50  5 p35  5 p45 1  p40:50
5 35 40
5 45 50
5 35
5 45
40
50
 0.01048
Alternatively,
6
p35  5 p35  p40   0.90 1  0.03  0.873
6
p45  5 p45  p50   0.80 1  0.05   0.76
5 q35:45
 5 p35:45  6 p35:45
  5 p35  5 p45  5 p35:45    6 p35  6 p45  6 p35:45 
  5 p35  5 p45  5 p35  5 p45    6 p35  6 p45  6 p35  6 p45 
  0.90  0.80  0.90  0.80    0.873  0.76  0.873  0.76 
 0.98  0.96952
 0.01048
Question #124 – Removed
Question #125 - Removed
MLC‐09‐11
66
Question #126
Answer: E
Let
Y = present value random variable for payments on one life
S   Y  present value random variable for all payments
E Y  10a40  148166
.
Var Y  10
2
d
2
2
A40  A40
d
d
i
2
ib
g
2
.
. / 0.06
 100 0.04863  016132
106
2
.
 70555
E S  100 E Y  14,816.6
Var S  100 Var Y  70,555
Standard deviation S  70,555  265.62
By normal approximation, need
E [S] + 1.645 Standard deviations = 14,816.6 + (1.645) (265.62)
= 15,254
Question #127
Answer: B
e
5 A30  4 A301 :20
Initial Benefit Prem 
Where
e
j
5a30:35  4a30:20
b
g b
g b
g

 4 0.02933
5 010248
.
5 14.835  4 11959
.

0.5124  011732
0.39508
.

 0.015
74.175  47.836
26.339
b
g
j
1
A30
 A30:20  A30:201  0.32307  0.29374  0.02933
:20
and
a30:20 
1  A30:20
d

1  0.32307
 11959
.
0.06
106
.
FG IJ
H K
Comment: the numerator could equally well have been calculated as
A30  4 20 E30 A50 = 0.10248 + (4) (0.29374) (0.24905) = 0.39510
MLC‐09‐11
67
Question #128
Answer: B
0.75
b gb g
px  1  0.75 0.05
 0.9625
0.75
b gb g
p y  1  0.75 .10
 0.925
0.75 qxy  1 0.75 pxy
b p gd p i since independent
= 1- b0.9625gb0.925g
 1
0.75
x
0.75
y
 01097
.
Question #129
Answer: D
Let G be the expense-loaded premium.
Expected present value (EPV) of benefits = 100,000A35
EPV of premiums = Ga35
EPV of expenses =  0.1G  25   2.50 100   a35
Equivalence principle:
Ga35  100,000 A35   0.1G  25  250  a35
A35
 0.1G  275
a35
0.9G  100,000 P35  275
G  100,000
G
100 8.36   275
0.9
 1234
MLC‐09‐11
68
Question #130
Answer: A
The person receives K per year guaranteed for 10 years  Ka10  8.4353K
The person receives K per years alive starting 10 years from now 10 a40 K
b
g
*Hence we have 10000  8.435310 E40a50 K
Derive
10 E40:
1
A40  A4010

:
10 E40
Derive a50 

b
10 E40
1
A40  A40
:10
A50

gA
50
0.30  0.09
 0.60
0.35
1  A50 1  0.35

 16.90
.04
d
104
.
Plug in values:
10,000  8.4353  0.60 16.90 K
c
b gb
gh
 18.5753K
K  538.35
MLC‐09‐11
69
Question #131
Answer: D
z
11

STANDARD: e25:11 
MODIFIED:
p25

0
e z
FG1  t IJ dt  t  t
H 75K
2  75
2
1
 0.1ds
0
e2511
: 
11
 101933
.
0
 e .1  0.90484
z
1
p dt
0 t 25
 p25
z FGH
z FGH
10
0
1
IJ
K
t
dt
74
IJ
K
F t I
1 e

 e Gt 
01
.
H 2  74 JK
 0.95163  0.90484b9.32432g  9.3886

z
1 0.1t
0
e
dt  e0.1
0.1
0.1
10
0
1
t
dt
74
2
10
0
Difference
=0.8047
Question #132
Answer: B
Comparing B & D: Prospectively at time 2, they have the same future benefits. At
issue, B has the lower benefit premium. Thus, by formula 7.2.2, B has the higher
reserve.
Comparing A to B: use formula 7.3.5. At issue, B has the higher benefit premium.
Until time 2, they have had the same benefits, so B has the higher reserve.
Comparing B to C: Visualize a graph C* that matches graph B on one side of t=2
and matches graph C on the other side. By using the logic of the two preceding
paragraphs, C’s reserve is lower than C*’s which is lower than B’s.
Comparing B to E: Reserves on E are constant at 0.
MLC‐09‐11
70
Question #133
Answer: C
Since only decrements (1) and (2) occur during the year, probability of reaching
the end of the year is
p60
b1g  p60
b 2g  1  0.01 1  0.05  0.9405
b
gb
g
Probability of remaining through the year is
p60
.  0.84645
b1g  p60
b 2g  p60
b3g  1  0.01 1  0.05 1  010
b
gb
gb
g
Probability of exiting at the end of the year is
b3g  0.9405  0.84645  0.09405
q60
Question #134 - Removed
Question #135
Answer: D
EPV of regular death benefit 

zb

0
gd
ib
gd
zb

0
gd ib
gd i
100000 e- t 0.008 e-  t dt
i
100000 e-0.06t 0.008 e-0.008t dt
b
g
 100000 0.008 / 0.06  0.008  11,764.71
EPV of accidental death benefit 

zb
30
0
gd
ib
gd
i
zb
30
0
gd ib
100000 e-0.06t 0.001 e-0.008t dt
 100 1  e-2.04 / 0.068  1,279.37
Total EPV  11765  1279  13044
MLC‐09‐11
gd i
100000 e- t 0.001 e-  t dt
71
Question #136
Answer: B
b gb
g b gb
g
g b gb
g
l 60 .6  .6 79,954  .4 80,625
 80,222.4
b gb
l 60 1.5  .5 79,954  .5 78,839
 79,396.5
0.9 q 60 .6
80222.4  79,396.5
80,222.4
 0.0103

Question #137 - Removed
Question #138
Answer: A
b g  qb1g  qb2g  0.34
q40
40
40
1
2
 1  p40
b g p40
b g
0.34  1  0.75 p40
 b 2g
p40
 b 2g  0.88
q40
. y
 b 2g  012
q41
 b 2g  2 y  0.24
b gb g
l b g  2000b1  0.34gb1  0.392g  803
b g  1  0.8 1  0.24  0.392
q41

42
MLC‐09‐11
72
Question #139
Answer: C
b g
Pr L  '  0  0.5
Pr 10,000v K 1   ' aK 1  0  0.5
From Illustrative Life Table,
47
p30  0.50816 and
48
p30 .47681
Since L is a decreasing function of K, to have
Pr L    0  0.5 means we must have L    0 for K  47.
b g
b g
b g
Highest value of L   for K  47 is at K = 47.
b g
L   at K  47  10,000 v 471    a471
b g
 609.98  16.589 
b
g
L    0  609.98  16.589    0
  
609.98
 36.77
16.589
Question #140
Answer: B
b g
Prb K  1g  p  p  0.9  0.81  0.09
Prb K  1g  p  0.81
E bY g = .1  1.09  187
. .81  2.72  2.4715
E dY i = .1  1 .09  187
. .81  2.72  6.407
VARbY g  6.407  2.4715  0.299
Pr K  0  1  px  01
.
1 x
2 x
2 x
2
2
2
2
2
MLC‐09‐11
73
Question #141
Answer: E
E  Z   b Ax
since constant force Ax   /(    )
E(Z) 
b  0.02 
b

 b/3
 
 0.06 
Var  Z   Var b vT   b 2 Var v   b 2

2
Ax  Ax2

2
 
   

b 

   2      


 2 1
 4
 b2     b2  
10 9 
 45 
2
Var  Z   E  Z 
4 b
b2   
 45  3
4 1
b     b  3.75
 45  3
Question #142
Answer: B
b g b g c AA h
2 2
In general Var L  1  P
c h
Here P Ax 
x
2
x
1
1
   .08 .12
ax
5
F .12 I
So Var b Lg  G 1  J c A  A h .5625
H .08K
F b.12gIJ c A  A h
and Var b L *g  G 1 
H .08 K
b1  g b0.5625g .744
So Var b L *g 
b1  g
E L *  A .15a  1  a b .15g  1  5b.23g  .15
E L *  Var b L *g .7125
2
2
2
x
x
2
5
4
2
x
2
x
15 2
8
12 2
8
x
MLC‐09‐11
x
x
74
Question #143 - Removed
Question #144
Answer: B
Let l0b g  number of students entering year 1
superscript (f) denote academic failure
superscript (w) denote withdrawal
subscript is “age” at start of year; equals year - 1
p0b g  1  0.40  0.20  0.40
l2b g  10 l2b g q2b f g  q2b f g  01
.
b
g
q2b wg  q2b g  q2b f g  10
.  0.6  01
.  0.3
l1b gq1b f g  0.4 l1b g 1  q1b f g  q1b wg
e
j
q1b f g  0.4 1  q1b f g  0.3
e
q1b f g 
j
0.28
 0.2
14
.
p1b g  1  q1b f g  q1b wg  1  0.2  0.3  0.5
b g  q b w g  p b g q b w g  p b g p b g q b w g
w
3 q0
0
0
1
0
1
2
b gb g b gb gb g
 0.2  0.4 0.3  0.4 0.5 0.3
 0.38
MLC‐09‐11
75
Question #145
Answer: D
e25  p25 (1  e26 )
M
e26N  e26
due to having the same 
1
M 0.05
p25N  exp    25Mt  0.1(1  t )dt   p25
e
 0

M
M
e25N  p25N (1  e26 )  e 0.05 p25
(1  e26 )  0.951e25
 9.51
Question #146
Answer: D
b g
F c1  A hI  10,000,000
 100b10,000gG
H  JK
E YAGG  100E Y  100 10,000 a x
x
b10,000g 1 c A  A h
b10,000g b0.25g  b016
. g  50,000


 Y  Var Y 
2
2
x
2
b
2
x
g
 AGG  100 Y  10 50,000  500,000
0.90  Pr
LM F  E Y
N 
AGG
0
AGG
 1282

.
OP
Q
F  E YAGG
 AGG
F  1282
.  AGG  E YAGG
b
g
F  1282
.
500,000  10,000,000  10,641,000
MLC‐09‐11
76
Question #147
Answer: A
1
A30:3
 1000vq30  500v 2 1 q30  250v3 2 q30
2
3
 1  1.53 
 1 
 1.61 
 1 
 1.70 
 1000 

  500 
  0.99847  
  250 
  0.99847  0.99839  

 1.06  1000 
 1.06 
 1000 
 1.06 
 1000 
 1.4434  0.71535  0.35572  2.51447
1
1 1
 1 2
 0.00153 
1
a30:1  1 2  1 2 
 1  2 q30     0.97129  1 

2 2
2
 1.06 


1 1
   0.97129  0.999235 
2 2
 0.985273
2.51447
Annualized premium 
0.985273
 2.552
 2 
2.552
2
 1.28
Each semiannual premium 
Question: #148
Answer: E
b DAg
1
80:20
q80 .2
q80 .1
eb g j
 20vq80  vp80 DA
bg
1
8119
:
b g
b g
b g
b g b gb g
2.9b12.225g

 12.267
20 .2
.8
1

DA 81
:19
106
.
106
.
13 106
. 4
1
 DA 8119

 12.225
:
.8
DA801 :20  20 v .1  v .9 12.225
13 
.
106
Question #149 - Removed
MLC‐09‐11
77
Question #150
Answer: A
t
LM
N
px  exp 


z
OP
Q
b
ds
 exp ln 100  x  s
0 100  x  s
t

g
t
0

100  x  t
100  x

e50:60  e50  e60  e50:60

e50

e60
LM
OP  25
z
N
Q
t O
40  t
1 L
40t  P  20
dt 
z
M
40
40 N
2Q
F 50  t IJ FG 40  t IJ dt  z 1 d2000  90t  t idt
z G
H 50 K H 40 K
2000
I  14.67
t
1 F
2000t  45t 

G
2000 H
3 JK
50
50 50  t
0
t2
1
50t 
dt 
50
50
2
0
2 40
40
0
0

e50:60
40
40
0
0
2
3
2
40
0

e50:60  25  20  14.67  30.33
Question #151
Answer: C
Ways to go 0  2 in 2 years
0  0  2; p   0.7  0.1  0.07
0  1  2; p   0.2  0.25   0.05
0  2  2; p   0.11  0.1
Total = 0.22
Binomial m = 100 q = 0.22
Var = (100) (0.22) (0.78) = 17
MLC‐09‐11
78
Question #152
Answer: A
For death occurring in year 2
0.3  1000
EPV 
 285.71
1.05
For death occurring in year 3, two cases:
(1) State 2  State 1  State 4: (0.2  0.1) = 0.02
(2) State 2  State 2  State 4: (0.5  0.3) = 0.15
Total
0.17
EPV =
0.17 1000
 154.20
1.052
Total. EPV = 285.71 + 154.20 = 439.91
Question #153 - Removed
Question #154
Answer: C
Let  denote the single benefit premium.
  30 a35   A351 :30

30
a35
1
1  A35
:30
eA

35:30
j
1
a65
 A35
:30
1
1  A35
:30


b.21.07g9.9
b1.07g
1.386
.93
 1.49

MLC‐09‐11
79
Question #155
Answer: E
0.4 p0
.5  e z

0. 4
0
e F e2 x jdx
LM e22x OP.4
N Q0
e
0.8
.4 F F e 2 1I
H
K
e
.4 F 
.5  e.4 F .6128
bg
 ln .5  .4 F .6128
 .6931  .4F .6128
 F  0.20
Question #156
Answer: C
 9V  P  1.03  qx9b  1  qx9  10V
 qx 9  b  10V   10V
 3431.03  0.02904  872   10V
 10V  327.97
b   b  10V   10V  872  327.97  1199.97
 1

1
0.03 

P  b   d   1200 


 14.65976 1.03 
 ax

= 46.92
9V  benefit reserve at the start of year ten – P = 343 – 46.92 = 296.08
Question #157
Answer: B
d = 0.06  V = 0.94
Step 1 Determine px
668  258vpx  1000vqx  1000v 2 px  p x 1  qx 1 
668  258  0.94  px  1000  0.94  1  px   1000  0.8836  px 1
668  242.52 px  940 1  px   883.6 px
px  272 / 298.92  0.91
MLC‐09‐11
80
Step 2 Determine 1000 Px:2
668  258  0.94  0.91  1000 Px:2 1   0.94  0.91 
 220.69  668  479
1000 Px:2 
1.8554
Question #158
Answer: D
1
1
1
100,000  IA 40:10  100,000 v p40  IA 41:10  10 v10 9 p41 q50   A40:10
100,000 




 8,950,901 
10 



0.99722 
9, 287, 264 
0.16736  
0.00592
 100,000



1.06 
1.0610





  0.02766  100,000 
see comment 
=15,513
1
 A40  10 E40 A50
Where A40:10
 0.16132   0.53667  0.24905 
 0.02766
Comment: the first line comes from comparing the benefits of the two insurances.
At each of age 40, 41, 42,…,49  IA 40:10 provides a death benefit 1 greater than
1
 IA141:10 .
1
Hence the A40:10
term. But  IA 41:10 provides a death benefit at 50 of 10,
1
while  IA 40:10 provides 0. Hence a term involving 9 q41  9 p41 q50 . The various v’s
1
and p’s just get all expected present values at age 40.
MLC‐09‐11
81
Question #159
Answer: A
1000 1V   1  i   qx 1000  1000 1V 
40  80 1.1  qx 1000  40 
qx 
88  40
 0.05
960
1 AS



G 
expenses 1  i   1000qx
px
100   0.4 100   1.1  1000  0.05
1  0.05
60 1.1  50
 16.8
0.95
Question #160
Answer: C
1
At any age, px    e 0.02  0.9802
1
1
qx    1  0.9802  0.0198 , which is also qx  , since decrement 2 occurs only at the
end of the year.
Expected present value (EPV) at the start of each year for that year’s death
benefits
= 10,000*0.0198 v = 188.1

px   0.9802*0.96  0.9410

Ex  px v  0.941 v  0.941*0.95  0.8940
EPV of death benefit for 3 years 188.1  E40 *188.1  E40 * E41 *188.1  506.60
MLC‐09‐11
82
Question #161
Answer: B
40

e30:40 
 t p30dt
0
  30  t
dt
  30
0
40


t
t2
2   30 
40
0
800
  30
 27.692
 40 
  95
Or, with a linear survival function, it may be simpler to draw a picture:
0
p30  1
40
30
70

e30:40  area =27.692  40
40
p30
p30  0.3846
1  40 p30 
2
  70
 0.3846
  30
  95
t
p30 
65  t
65
Var  E T    E T  
2
MLC‐09‐11
2
83
Using a common formula for the second moment:

Var T    2 t t px dt  ex2

0
 65 
t 
t 

 2  t 1  dt    1   dt 2

65 
0 
 0  65 
65
 2*  2112.5  1408.333   65  65 / 2 
2
 1408.333  1056.25  352.08
Another way, easy to calculate for a linear survival function is

Var T    t 2 t px  x  t  dt 
0
65
  t2 
0
t3

3  65
0
t t px  x  t  dt
1
1 
 65
dt    t  dt 
0
65
65 

65
0


 t2

 2  65
65 
0

2
2
2


 1408.33   32.5   352.08
2
With a linear survival function and a maximum future lifetime of 65 years, you
probably didn’t need to integrate to get E T30   e30  32.5

Likewise, if you realize (after getting   95 ) that T30 is uniformly distributed on (0,
65), its variance is just the variance of a continuous uniform random variable:
2
65  0 

Var 
12
 352.08
Question #162
Answer: E
218.15 1.06   10,000  0.02 
 31.88
1  0.02
 31.88  218.151.06    9,000  0.021  77.66
2V 
1  0.021
1V

MLC‐09‐11
84
Question #163
Answer: D

ex  e y   t px  0.95  0.952  ...
k 1
0.95
 19
1  0.95
exy  pxy  2 pxy  ...

 1.02  0.95  0.95   1.02  0.95   0.95   ...
2
1.02  0.95 
 1.02 0.95  0.95  ... 
1  0.952
exy  ex  e y  exy  28.56
2
4
2
2
 9.44152
Question #164 - Removed
Question #165 - Removed
Question #166
Answer: E

ax   e 0.08t dt  12.5
0

3
 0.375
8

3
2
Ax   e 0.13t  0.03 dt   0.23077
0
13
2
1 2
2
 aT  Var  aT  
Ax   Ax    400  0.23077   0.375    6.0048
2 






Ax   e 0.08t  0.03 dt 
0
 
 
Pr  aT  ax   aT   Pr  aT  12.5  6.0048
 1  vT

 Pr 
 6.4952   Pr 0.67524  e0.05T 
 0.05

 ln 0.67524 

 Pr T 
  Pr T  7.85374
0.05

 e 0.037.85374  0.79
MLC‐09‐11
85
Question #167
Answer: A
5
 0.05 5
 
p50
 e     e 0.25  0.7788
1
5 q55
5 1
 0.03 0.02 t
  55
dt    0.02 / 0.05  e 0.05t
t  e
0

 0.4 1  e
0.25

= 0.0885
 

Probability of retiring before 60  5 p50
 5 q55
= 0.7788*0.0885
= 0.0689

MLC‐09‐11
1
86
5
0
Question #168
Answer: C
Complete the table:
l81  l80  d80  910
l82  l81  d81  830 (not really needed)
1

1

e x  ex 
 since UDD 
2
2


e x  e x  1 2
 l  l  l  1


e x   81 82 83
l80

 2


 e  1  l  l  l   Call this equation (A)
 80 2  80 81 82




 e  1  l  l   Formula like (A), one age later. Call this (B)
 81 2  81 82


Subtract equation (B) from equation (A) to get




1
1




l81  e80  l80  e81  l81


2
2






910  8.5  0.51000  e81  0.5 920



e81 
8000  460  910
 8.21
920
MLC‐09‐11
87
Alternatively, and more straightforward,
910
 0.91
1000
830
p81 
 0.902
920
830
p81 
 0.912
910
p80 

e80  1 q 80  p 80 1  e 81 
 
2  


1
where q80 contributes
since UDD
2
1
  
8.5  1  0.91   0.91 1  e81 
2



e81  8.291
1
  

e81  q81  p81  1  e82 
2


1
  
8.291  1  0.912   0.912  1  e82 
2



e82  8.043
1
  

e81  q81  p81  1  e82 
2


1
 1  0.902    0.902 1  8.043
2
 8.206

Or, do all the recursions in terms of e, not e , starting with e80  8.5  0.5  8.0 , then

final step e81  e81  0.5
MLC‐09‐11
88
Question #169
Answer: A
T
p x t
0
1
2
3
px
vt
vt t px
0.7
1
1
0.7

0.7
0.49


0.95238
0.90703
–
1
0.6667
0.4444
t
2
From above ax:3   vt t px  2.1111
t 0
 a
1000 2Vx:3  1000  1  x  2:1

ax:3


1 

  1000 1 
  526

 2.1111 

Alternatively,
Px:3 
1
 d  0.4261
ax:3

1000 2Vx:3  1000 v  Px:3

 1000  0.95238  0.4261
 526
You could also calculate Ax:3 and use it to calculate Px:3 .
MLC‐09‐11
89

Question #170
Answer: E
Let G be the gross premium.
Expected present value (EPV) of benefits = 1000A50 .
EPV of expenses, except claim expense = 15  1 a50
EPV of claim expense = 50A50 (50 is paid when the claim is paid)
EPV of premiums = G a50
Equivalence principle: Ga50  1000 A50  15  1 a50  50 A50
1050 A50  15  a50
G
a50
For the given survival function,
a50 1  1.0550
1 50 k
1 50 k
(

)

(2)


 0.36512
A50 
v
l
l
v
 50k 1 50k 100 
50
0.05(50)
l50 k 1
k 1
1  A50
a50 
 13.33248
d
Solving for G,
G = 30.88
Question #171
Answer: A
4
 0.05 4
p50  e     0.8187
10
8
 0.05 10
p50  e     0.6065
 0.04 8
p60  e     0.7261
18
p50   10 p50  8 p60   0.6065  0.7261
 0.4404
414 q50  4 p50  18 p50  0.8187  0.4404  0.3783
MLC‐09‐11
90
Question #172
Answer: D
a40:5  a40  5 E40 a45
 14.8166   0.73529 14.1121
 4.4401
 a40:5  100,000 A45 v5 5 p40    IA 40:5
1

1
  100,000 A45  5 E40 / a40:5   IA 40:5

 100,000  0.20120  0.73529  /  4.4401  0.04042 
 3363
Question #173
Answer: B
Calculate the probability that both are alive or both are dead.
P(both alive) = k pxy  k px  k p y
P(both dead) = k qxy  k q x k q y
P(exactly one alive) = 1  k pxy  k qxy
Only have to do two year’s worth so have table
Pr(both alive)
Pr(both dead)
Pr(only one alive)
1
0
0
(0.91)(0.91) = 0.8281
(0.09)(0.09) = 0.0081
0.1638
(0.82)(0.82) = 0.6724
(0.18)(0.18) = 0.0324
0.2952
0.8281 0.6724 
0.1638 0.2952 
 1
 0
EPV Annuity  30, 000 


 20, 000 


  80, 431
0
1
2 
0
1.05
1.05 
1.051
1.052 
 1.05
 1.05
Alternatively,
0.8281 0.6724

 2.3986
1.05
1.052
0.91 0.82
ax:3  ay:3  1 

 2.6104
1.05 1.052
EPV  20, 000 ax:3  20, 000 ay:3  10, 000 axy:3
axy:3  1 
(it pays 20,000 if x alive and 20,000 if y alive, but 10,000 less than that if
both are alive)
  20,000  2.6104    20,000  2.6104   10,000  2.3986  80, 430
MLC‐09‐11
91
Question #174
Answer: C
Let P denote the gross premium.

P  ax   e
E  L 
0
axIMP
10
axIMP
 t   t
 e
e

dt   e 0.05t dt  20
0
P
0.03t 0.02t
e
dt  e
0.0310  0.0210 
e
0

e
0.03t 0.01t
e
dt
0
l  e 0.5 e0.5

 23
0.05
0.04
E  L   23  20  3

E  L 3

 15%
P
20
Question #175
Answer: C
1
A30:2
 1000vq30  500v 2 1 q 30
2
 1 
 1 
 1000 
  0.00153  500 
  0.99847  0.00161
 1.06 
 1.06 
 2.15875
Initial fund  2.15875  1000 participants = 2158.75
Let Fn denote the size of Fund 1 at the end of year n.
F1  2158.75 1.07   1000  1309.86
F2  1309.86 1.065   500  895.00
Expected size of Fund 2 at end of year 2 = 0 (since the amount paid was the
single benefit premium). Difference is 895.
MLC‐09‐11
92
Question #176
Answer: C
2
Var  Z   E  Z 2   E  Z 

E Z   

t
t t
0

v b 

0
E  Z 2   
px  x t dt   e 0.08t e0.03t e 0.02t  0.02  dt
0
0.02 2

 0.02  e0.07t dt 
7
0.07

0
 vt bt 
2
t
px  x t dt  

0
e

  0.02 e 0.12t  x t dt  2
0
Var  Z  
 
1 2

7
6
2

12
0.05t
1

2
e0.02t  0.02  dt
6
1 4

 0.08503
6 49
Question #177
Answer: C
0.1
8   311
1.1
0.1
 1
 6   511
1.1
 we have Ax  1 
From Ax  1  d ax
Ax 10
Ax  Ax  i
Ax 
3
0.1

 0.2861
11 ln 1.1
Ax 10 
10V

5
0.1

 0.4769
11 ln 1.1
 Ax 10  P  Ax   ax 10
 0.2861 
 0.4769  
6
 8 
= 0.2623
There are many other equivalent formulas that could be used.
MLC‐09‐11
93
Question #178
Answer: C

  100,000  e 0.06t  e 0.001t 0.001dt
Regular death benefit
0
0.001 

 100,000 

 0.06  0.001 
 1639.34
Accidental death
  100,000 e 0.06t e 0.001t  0.0002  dt
10
0
10
 20  e 0.061t dt
0
1  e 0.61 
 20 
  149.72
 0.061 
Expected Present Value  1639.34  149.72  1789.06
Question #179
Answer: C
00
p61
 560 / 800  0.70
01
p61
 160 / 800  0.20
10
p61
 0, once dead, stays dead
11
p61
 1, once dead by cause 1, stays dead by cause 1
00
01
10
11
p61
 p61
 p61
 p61
 0.70  0.20  0  1  1.90
Question #180 - Removed
MLC‐09‐11
94
Question #181
Answer: B
Pr(dies in year 1)  p 02  0.1
Pr(dies in year 2)  p 00 p 02  p 01 p12  0.8(0.1)  0.1(0.2)  0.10
Pr(dies in year 3)  p 00 p 00 p 02  p 00 p 01 p12  p 01 p11 p12  p 01 p10 p 02  0.095
EPV (benefits)  100, 000[0.9(0.1)  0.92 (0.10)  0.93 (0.095)]  24, 025.5
Pr(in State 0 at time 0)  1
Pr(in State 0 at time 1)  p 00  0.8
Pr(in State 0 at time 2)  p 00 p 00  p 01 p10  0.8(0.8)  0.1(0.1)  0.65
EPV ($1 of premium)  1  0.9(0.8)  0.92 (0.65)  2.2465
Benefit premium = 24,025.5/2.2465 = 10,695.
Question #182 - Removed
Answer: A
Question #183 - Removed
Question #184
Answer: B
1000 P45a45:15   a60:15  15 E45  1000 A45
1000
A45
 a45  15 E45 a60     a60  15 E60 a75  15 E45   1000 A45
a45
201.20
14.1121   0.72988 0.5108111.1454 
14.1121
 11.1454   0.68756  0.39994  7.2170     0.72988  0.51081  201.20
where
15 E x
was evaluated as 5 Ex  10 Ex 5
14.2573  9.9568     3.4154   201.20
  17.346
MLC‐09‐11
95
Question #185
Answer: A
1V
  0 V    1  i   1000  1V  1V  qx
2V
  1V   1  i    2000  2V  2V  qx 1  2000
  1  i   1000q   1  i   2000q  2000
  1.08  1000  0.1    1.08  2000  0.1  2000
x 1
x
  1027.42
Question #186
Answer: A
Let Y be the present value of payments to 1 person.
Let S be the present value of the aggregate payments.
E Y   500 ax  500
 Y  Var Y  
1  Ax   5572.68
d
 500 2
1
d2

2

Ax  Ax2  1791.96
S  Y1  Y2  ...  Y250
E  S   250 E Y   1,393,170
 S  250   Y  15.811388 Y  28,333
 S  1,393,170 F  1,393,170 
0.90  Pr  S  F   Pr 

28,333 
 28,333
F  1,393,170 

 Pr  N  0,1 
28,333 

0.90  Pr  N  0,1  1.28 
F  1,393,170  1.28  28,333
=1.43 million
MLC‐09‐11
96
Question #187
Answer: A
q  b1g  1  p b1g  1  e p b g j
41
41
bg
q41 1
41
bg
q41 


1
2
l41   l40   d 40   d 40   1000  60  55  885
1

2

d 41   l41   d 41   l42   885  70  750  65
q41 
1
750

p41  
885
 
q41
750 
 1  1  
q41

 885 
65
135

65
135
 0.0766
Question #188
Answer: D

t 

S0 (t )  1  
 
d

t 
log  S0 (t )  
 t
dt

ex  
0

t 
x
1 
 dt 
 1
  x
 x 
1



e0new   old
 new
  new  2 old  1
2  1 
1
old
old
2  1 9 
 
  old  4
 0new  

4 
MLC‐09‐11
97
Question #189
Answer: C
Constant force implies exponential lifetime
2
2
2 1
1
Var T   E T 2    E T   2     2  100
  
  0.1

E  min T ,10     t  0.1e .1t dt   10  0.1e.1t dt
10
0
10
 te .1t  10e
1
.1t 10
0
 10e.1t
1
 10e  10e  10  10e

10
1
 10 1  e 1   6.3
Question #190
Answer: A
Gax:15
% premium amount for 15 years

 100,000 Ax  0.08G  0.02Gax:15    x  5   5ax 




Per policy for life
4669.95 11.35   51, 481.97   0.08  4669.95    0.02 11.35  4669.95     x  5   5ax 
ax 
1  Ax 1  0.5148197

 16.66
d
0.02913
53,003.93  51, 481.97  1433.67   x  5   83.30
4.99   x  5 
x  9.99
The % of premium expenses could equally well have been expressed as
0.10G  0.02G ax:14 .
The per policy expenses could also be expressed in terms of an annuityimmediate.
MLC‐09‐11
98
Question #191
Answer: D
For the density where Tx  Ty ,


Pr Tx  Ty  
40
y
50
40
0.0005dxdy  
0.0005dxdy
y 0 x 0
y  40 x 0

40
y 0
y
0.0005 x dy  
0
y  40
40
50
0
y  40
  0.0005 ydy  

50
0.0005 y 2
2
40
0
 0.02 y
0.0005 x
40
dy
0
0.02 dy
50
40
 0.40 + 0.20 = 0.60
For the overall density,
Pr Tx  Ty  0.4  0  0.6  0.6  0.36


where the first 0.4 is the probability that Tx  Ty and the first 0.6 is the probability
that Tx  Ty .
Question #192
Answer: B
The conditional expected value of the annuity, given  , is
1
.
0.01  
The unconditional expected value is
0.02
1
 0.01  0.02 
ax  100
d   100 ln 
  40.5
0.01 0.01  
 0.01  0.01 
100 is the constant density of  on the interval  0.01,0.02 . If the density were not
constant, it would have to go inside the integral.
MLC‐09‐11
99
Question #193
Answer: E

Recall ex 

x
2



ex:x  ex  ex  ex:x

ex:x  
t 
t 
 dt
1 
 1 
   x    y 
x 
0
Performing the integration we obtain
x

ex:x 
3
2   x 

ex:x 
3
2   2a 
2   3a 
 3
 2  7a
3
3
2   3a 
2
  a   k 
3
3
3.5a  a  k  3.5a  3a 
k 5
(i)
(ii)
The solution assumes that all lifetimes are independent.
Question #194
Answer: B
Although simultaneous death is impossible, the times of death are dependent as
the force of mortality increases after the first death. There are two ways for the
benefit to be paid. The first is to have (x) die prior to (y). That is, the transitions are
State 0 to State 2 to State 3. The EPV can be written with a double integral


0

e 0.04t t pxy00  x02t: y t  e 0.04 r r px22t: y t  x23t  r: y t  r drdt
0


0
0
  e 0.04t e 0.12t 0.06  e 0.04 r e 0.10 r 0.10drdt 
0.06 0.10
 0.26786
0.16 0.14
By symmetry, the second case (State 0 to State 1 to State 3) has the same EPV.
Thus the total EPV is 10,000(0.26786+0.26786) = 5,357.
MLC‐09‐11
100
Question #195
Answer: E
Let
k
p0  Probability someone answers the first k problems correctly.
2
p0   0.8   0.64
4
p0   0.8   0.41
2
p0:0   2 p0   0.642  0.41
4
p0:0   0.41  0.168
2
p0:0  2 p0  2 p0  2 p0:0  0.87
4
p0:0  0.41  0.41  0.168  0.652
2
4
2
2
Prob(second child loses in round 3 or 4) = 2 p0:0  4 p0:0
= 0.87-0.652
= 0.218
Prob(second loses in round 3 or 4 second loses after round 2) =
2
p0:0  4 p0:0
2
=
p0:0
0.218
 0.25
0.87
Question #196
Answer: E
If (40) dies before 70, he receives one payment of 10, and Y = 10. The probability
of this is (70 – 40)/(110 – 40) = 3/7
If (40) reaches 70 but dies before 100, he receives 2 payments.
Y  10  20v30  16.16637
The probability of this is also 3/7.
If (40) survives to 100, he receives 3 payments.
Y  10  20v30  30v 60  19.01819
The probability of this is 1 – 3/7 – 3/7 = 1/7
E Y    3/ 7  10   3/ 7   16.16637  1/ 7   19.01819  13.93104
 
E Y 2   3/ 7   102   3/ 7   16.16637 2  1/ 7  19.018192  206.53515
 
Var Y   E Y 2   E Y    12.46
Since everyone receives the first payment of 10, you could have ignored it in the
calculation.
MLC‐09‐11
2
101
Question #197
Answer: C
2

E  Z    v k 1bk 1
k 0

k
px qxk
  v  300   0.02  v 2  350  0.98  0.04   v3 400  0.98  0.96  0.06  
 36.8
 
2

E Z 2   v k 1bk 1
k 0

2
k
px qx  k
 v 2  300   0.02  v 4  350   0.98  0.04   v 6 4002  0.98  0.96  0.06
2
2
 11,773
 
Var  Z   E Z 2  E  Z 
2
 11,773  36.82
 10, 419
Question #198
Answer: A
Benefits +
3
0 Le  1000v 
Expenses
 0.20G  8    0.06G  2  v   0.06G  2  v 2
at G  41.20 and i  0.05,
0L
 for K  2   770.59
MLC‐09‐11
102
– Premiums
 G a3
Question #199
Answer: D
P  1000 P40
 235  P 1  i   0.015 1000  255  255
[A]
 255  P 1  i   0.020 1000  272   272
[B]
Subtract [A] from [B]
20 1  i   3.385  17
1 i 
Plug into [A]
20.385
 1.01925
20
 235  P 1.01925   0.015 1000  255  255
235  P 
255  11.175
1.01925
P  261.15  235  26.15
1000 25V 
 272  26.151.01925   0.0251000 
1  0.025
 286
MLC‐09‐11
103
Question #200
Answer: A
1.2
1
1
0.8
0.6
0.5
0.4
0.4
0.2
0
0
10
x
Give
n
0
s  x
1
55 q35
20 55 q15
20 55 q15
55 q35
 1
20
30
15
0.70
Linear
Interpolation
40
50
Give
n
25
60
35
0.50
0.48
Linear
Interpolation
s  90 
0.16 32
 1

 0.6667
0.48 48
s  35 

s  35   s  90  0.48  0.16 32


 0.4571
s 15 
0.70
70

0.4571
 0.6856
0.6667
MLC‐09‐11
104
70
Give
n
75
0.4
80
90
0
100
Given
90
100
0.16
Linear
Interpolation
0
Alternatively,
20 55 q15
55 q35

20 p15  55 q35
55 q35

20 p15

s  35 
s 15 
0.48
0.70
 0.6856

Question #201
Answer: A
S0 (80)  1 *  e ^  0.16*50   e ^  0.08*50    0.00932555
2
S0 (81)  1 *  e ^  0.16*51  e ^  0.08*51   0.008596664
2
p80  s  81 / s  80   0.008596664 / 0.00932555  0.9218
q80  1  0.9218  0.078
Alternatively (and equivalent to the above)
For non-smokers, px  e 0.08  0.923116
50
px  0.018316
For smokers, px  e 0.16  0.852144
50 p x  0.000335
So the probability of dying at 80, weighted by the probability of surviving to 80, is
0.018316  1  0.923116   0.000335  1  0.852144 
= 0.078
0.018316  0.000335
MLC‐09‐11
105
Question #202
Answer: B
x
40
41
42
lx 
2000
1920
1840

because 2000  20  60  1920 ;
d x 
20
30
40
d x 
60
50
1
2
1920  30  50  1840
Let premium = P
1840 2 
 2000 1920

v
v  P  2.749 P
EPV premiums = 
2000 
 2000 2000
30 2
40 3 
 20
EPV benefits = 1000 
v
v 
v   40.41
2000
2000 
 2000
40.41
P
 14.7
2.749
MLC‐09‐11
106
Question #203
Answer: A

10
a30   e0.08t e 0.05dt  10 Ex  e 0.08t e 0.08t dt
0
10 0.13t
 e
0
dt  e
0
1.3  0.16
0 e
e 0.13t 10
e 0.16t
 e 1.3
0.13 0
0.16
1.3
1.3
e
1
e



0.13 0.13 0.16
= 7.2992


dt

0

A30   e 0.08t e 0.05t  0.05  dt  e 1.3  e 0.16t  0.08  dt
10
0
0
 1
e 
e
 0.05 

   0.08 
0.16
 0.13 0.13 
 0.41606
1.3
1.3
= P  A30  
A30 0.41606

 0.057
a30 7.29923
1
1
a40 

0.08  0.08 0.16
A40  1   a40
 1   0.08 / 0.16   0.5
10V
 A30   A40  P  A30  a40
 0.5 
 0.057   0.14375
0.16
Question #204
Answer: C
Let T be the future lifetime of Pat, and [T] denote the greatest integer in T. ([T] is
the same as K, the curtate future lifetime).
L  100,000 vT  1600 a T
 1
 100,000vT  1600 a10
1600 a10
Minimum is 1600 a10
 12,973
MLC‐09‐11
0  T 10
10  t  20
20<t
when evaluated at i = 0.05
107
Question #205 - Removed
Question #206
Answer: A
Pax:3  EPV (stunt deaths)
 2500  2486 /1.08  2466 / 1.08 2 
 4 /1.08  5 / 1.08 2  6 / 1.08 3 

P
  500000 


2500
2500




P  2.77   2550.68
 p  921
Question #207
Answer: D
x2 

1
dx
s  x  dx 30  10,000 

 30

2
s  30 
 30 
1 

 100 

x3  80
x

30,000  30


0.91
33.833

0.91
 37.18
80

e30:50
80 
Question #208
Answer: B
A60  v   p60  A61  q60 
 1/1.06    0.98  0.440  0.02 
 0.42566
a60  1  A60  / d
 1  0.42566  /  0.06 /1.06 
 10.147
1000 10V  1000 A60  1000 P50  a60
 425.66  10.147  25
 172
MLC‐09‐11
108
Question #209
Answer: E
Let Y65  present value random variable for an annuity due of one on a single life
age 65.
Thus E Y65   a65
Let Y75  present value random variable for an annuity due of one on a single life
age 75.
Thus E Y75   a75
E (X)  50  2  a65  30 1 a75
 100  9.8969   30  7.217   1206.20
Var (X)  50  22Var Y65   30 1 Var Y75   200 13.2996   30 11.5339   3005.94
2
where Var Y65  
and Var Y75  
1
d2
1
d2

2

2

2
A65  A65


2
A75  A75

95th percentile  E  X   1.645
1
 0.05660 
1
 0.05660 
Var  X 
2
2
0.23603   0.4398 2   13.2996


0.38681   0.59149 2   11.5339


 1206.20  1.645  54.826 
 1296.39
Question #210
Answer: C

a   e  t  e  t dt 
0
EPV  50, 000 
1
0.5
1
 
1
 0.5    d   100, 000  ln   1  ln   0.5
1
 0.045  1 
 100,000  ln 

 0.045  0.5 
 65,099
Question #211 - Removed
Question #212 - Removed
MLC‐09‐11
109
Question #213 - Removed
Question #214
Answer: A
Let  be the benefit premium at issue.
  10,000
A45:20
a45:20
0.20120  0.25634  0.43980   0.25634 
 10,000 
14.1121  0.25634  9.8969 
 297.88
The expected prospective loss at age 60 is
10,00015V45:20  10,000 A60:5  297.88 a60:5
 10,000  0.7543  297.88  4.3407
 6250
1
where A60:5
 0.36913  0.68756  0.4398   0.06674
A60:51  0.68756
A60:5  0.06674  0.68756  0.7543
a60:5  11.1454  0.68756  9.8969  4.3407
1
After the change, expected prospective loss = 10,000 A60:5
 (Reduced Amount) A60:51
Since the expected prospective loss is the same
6250  10,000  0.06674    Reduced Amount  0.68756 
Reduced Amount = 8119
MLC‐09‐11
110
Question #215
Answer: D
Ax  Ax1:5  5 Ex Ax15 :7  12 Ex Ax 12
where
5 0.04  0.02 
 0.7408
5 Ex  e
0.04
Ax1:5 
 1  0.7408   0.1728
0.04  0.02
7  0.05 0.02 
 0.6126
7 E x 5  e
0.05 

Ax 1 5 :7  
 1  0.6126   0.2767
 0.05  0.02 
12 E x  5 E x  7 E x 5  0.7408  0.6126  0.4538
0.05
Ax 12 
 0.625
0.05  0.03
Ax  0.1728   0.7408  0.2767    0.4538  0.625 
= 0.6614
Question #216
Answer: A
EPV of Accidental death benefit and related settlement expense =
0.004
 89.36
 2000 1.05 
0.004  0.04  0.05
0.04
EPV of other DB and related settlement expense = 1000 1.05  
 446.81
0.094
EPV of Initial expense = 50
3
EPV of Maintenance expense =
 31.91
0.094
100
EPV of future premiums 
 1063.83
0.094
EPV of 0 L  89.36  446.81  50  31.91  1063.83
 445.75
Question #217 - Removed
Question #218 - Removed
MLC‐09‐11
111
Question #219
Answer: E
0.25 1.5 q x

0.25
px  1.75 px
Let  be the force of mortality in year 1, so 3  is the force of mortality in year 2.
Probability of surviving 2 years is 10%
 0.10  px px 1  e   e 3  e 4 


ln  0.1
 0.5756
 
4

0.25
1
px  e  4 0.5756   0.8660

1.75
px  px  0.75 px 1  e e
1.5 q x  0.25 
0.251.5 q x
0.25
px

0.25

3
 3 
4
e

13
 0.5756 
4
 0.1540
px  1.75 px 0.866  0.154

 0.82
0.866
0.25 p x
Question #220
Answer: C
500
1

500(110  x) 110  x
2
 1  xS   xS 
2
110  x
 xNS 
 l xS  l0S 110  x  [see note below]
2
Thus
S
t p20
lS
 90  t 
 20St 
902
l20
NS
t p25 
MLC‐09‐11
2
NS
l25
85  t 
t

NS
85
l25
112

e 20:25  

85
0 t
85
0
p20:25dt
S
NS
t p20 t p25 dt  
85
0
 90  t 2  85  t  dt
 90 2 85
85
1
2
90  t   90  t  5  dt


688,500 0
1
 85  90  t 3 dt  5 85  90  t 2 dt

0
688,500   0

85
   90  t 4 5  90  t 3 
1




688,500 
4
3
 0

1

 156.25  208.33  16, 402,500  1, 215,000
688,500
= 22.1
[There are other ways to evaluate the integral, leading to the same result].
The S0 ( x) form is derived as S0 ( x)  e
x 2 
 
dt
0  110t 
The lx form is equivalent.
Question #221
Answer: B
a30:20  a30:10  10 E30  a40:10
15.0364  8.7201  10 E30  8.6602
10 E30
 15.0364  8.7201 / 8.6602  0.72935
Expected present value (EPV) of benefits =
1
1
 1000  A40:10
 2000  10 E30  A50:10
 16.66  2  0.72935  32.61  64.23
EPV of premiums =   a30:10  2  0.72935  a40:10
   8.7201  2    0.72935  8.6602
 21.3527
  64.23/ 21.3527  3.01
MLC‐09‐11
113
e
2ln 110t 
x
0
 110  x 


 110 
2
Question #222
Answer: A
s25:15 
15V  P25 
1
P25:15
 P25:15 
1
A25:15
15 E25
P25:151 
(this is the retrospective reserve calculation)
0.05332  0.05107
 0.00225

0.05107  P25:151 
1
A25:15
15 E25

a25:15
15 E25
a25:15
1
A25:15
/ a25:15
15 E25
1
A25:15
/ a25:15


1

s25:15
0.00225
 0.04406
0.05107
0.01128
 0.22087
0.05107
25, 000 15V  25, 000  0.22087  0.04406   25, 000  0.17681  4420
P25 
s25:15 
There are other ways of getting to the answer, for example writing
A: the retrospective reserve formula for 15V .
B: the retrospective reserve formula forthe 15th benefit reserve for a 15-year
term insurance issued to (25), which = 0
Subtract B from A to get
1

P25  P25:15
s25:15  15V


Question #223
Answer: C
ILT:
We have p70  6,396,609 / 6,616,155  0.96682
2 p70  6,164,663/ 6,616,155  0.93176
e70:2  0.96682  0.93176  1.89858
CF:
0.93176  2 p70  e 2     0.03534
Hence e70:2  p70  2 p71  e    e 2   1.89704
DM: Since l70 and
model
MLC‐09‐11
2
p70 for the DM model equal the ILT, therefore l72 for the DM
114
also equals the ILT. For DM we have l70  l71  l71  l72  l71
DM 
 6,390, 409
Hence e70:2  6,390, 409 / 6,616,155  6,164,663/ 6,616,155  1.89763
So the correct order is CF < DM < ILT
You could also work with p’s instead of l’s. For example, with the ILT,
p70  1  0.03318   0.96682
2
p70   0.96682 1  0.03626   0.93176
Note also, since e70:2  p70  2 p70 , and
2
p70 is the same for all three, you could just
order p70 .
Question #224
Answer: D
 
l60
 1000

 
l61
 1000  0.99  0.97  0.90   864.27

 
d 60
 1000  864.27  135.73

 
d 60
 135.73 
3
 ln  0.9 
 ln  0.99  0.97  0.9  
 135.73 
0.1054
 98.05
0.1459
 
l62
 864.27  0.987  0.95  0.80   648.31

 
d 61
 864.27  648.31  215.96

 
d 61
 215.96 
3
 ln  0.80 
 ln  0.987  0.95  0.80  
 215.96 
 
 
So d60
 d 61
 98.05  167.58  265.63
3
3
MLC‐09‐11
115
0.2231
 167.58
0.2875
Question #225
Answer: B
t
t
p40  e 0.05t
p50   60  t  / 60
50t  1/  60  t 
10
0
t
p40:50 50t dt  
10 e
10
0.05t
0
1 e 0.05t
dt  
60
60  0.05  0



20
1  e 0.5  0.13115
60
Question #226
Answer: A
Actual payment (in millions) 
q3  1 
1 q3

3
5
 2  6.860
1.1 1.1
0.30
 0.5
0.60
0.30  0.10
 0.333
0.60
 0.5 0.333 
Expected payment = 10 

 7.298
2 
 1.1 1.1 
Ratio
6.860
 94%
7.298
Question #227
Answer: E
At duration 1
Kx
1
>1
1L
v
Px1:2
0  Px1:2
Prob
qx 1
1  qx 1
So Var  1 L   v 2 qx 1 1  qx 1   0.1296
MLC‐09‐11
116
That really short formula takes advantage of
Var  a X  b   a 2Var ( X ) , if a and b are constants.
Here a = v; b  Px1:2 ; X is binomial with p  X  1  qx 1 .
Alternatively, evaluate Px1:2  0.1303
 0.9  0.1303  0.7697 if K x  1
1 L  0  0.1303  0.1303 if K x  1
1L
E  1 L    0.2  0.7697    0.8  0.1303  0.0497
 
E 1 L2   0.2  0.7697    0.8  0.1303  0.1320
2
2
Var  1 L   0.1320   0.0497   0.1295
2
Question #228
Answer: C
P  Ax  
Ax
Ax
 Ax  0.1  13 



 0.05
ax  1  Ax  1  Ax
1  13 
  


 P  Ax  

Var  L    1 

 

1  0.05 
 1 

5  0.10 

2
2

2
2

2
Ax  Ax2
Ax  Ax2



Ax  Ax2  0.08888
 
Var  L  1  
 
2

2
Ax  Ax2

16 
 
 1 
  0.08888 
45  0.1 
2
 

1 
 4
 0.1 
  0.1
2
MLC‐09‐11
117
Question #229
Answer: E


Seek g such that Pr aT  40   g  0.25
aT is a strictly increasing function of T.
Pr T  40   60  0.25 since

 Pr aT
 40 
60
p40 
100  40
 0.25
120  40

 a60  0.25
g  a60  19.00
Question 230
Answer: B
 0.05 
A51:9  1  da51:9  1  
  7.1  0.6619
 1.05 
11V
  2000  0.6619   100  7.1  613.80
 10V  P  1.05  11V  q50  2000  11V 
 10V  100  1.05  613.80   0.011 2000  613.80 
10V
 499.09
where q50   0.00110    0.001  0.011
Alternatively, you could have used recursion to calculate A50:10 from A51:9 , then
a50:10
from A50:10 , and used the prospective reserve formula for 10V .
MLC‐09‐11
118
Question #231
Answer: C
1000 A81  1000 A80  1  i   q80 1000  A81 
689.52   679.80 1.06   q80 1000  689.52 
q80 
720.59  689.52
 0.10
310.48
q80  0.5q80  0.05
1000 A80  1000vq80  vp80 1000 A81
 1000 
0.05
0.95
 689.52 
 665.14
1.06
1.06
Question #232
Answer: D
lx 
776
752
d x 
8
8

42
43
d x 
16
16
1
2


1
2
 
 
l42
and l43
came from lx 1  lx   d x   d x 



2000 8v  8v 2  1000 16v  16v 2
EPV Benefits =
776
  76.40
 776  752v 
EPV Premiums  34 
   34 1.92  = 65.28
776


2V
 76.40  65.28  11.12
MLC‐09‐11
119
Question #233
Answer: B
pxx  1  qxx  0.96
px  0.96  0.9798
px 1:x 1  1  qx 1:x 1  0.99
px 1  0.99  0.995
ax  1  vpx  v 2  2 px  1 
0.9798  0.9798  0.995 

1.05
1.052
 2.8174
0.96  0.96  0.99 

 2.7763
1.05
1.052
EPV = 2000 ax  2000 ax  6000 axx
axx  1  vpxx  v 2  2 pxx  1 
  4000  2.8174    6000  2.7763
 27,927
Notes: The solution assumes that the future lifetimes are identically distributed.
The precise description of the benefit would be a special 3-year temporary life
annuity-due.
MLC‐09‐11
120
Question #234
Answer: B
t
1
1
1
px   x   t   qx   0.20
t
2
2
px   1  tqx   1  0.08t
t
3
3
px   1  tqx   1  0.125t
qx   
1
1
0t
1
1
2
3
1
1

px   x   t  dt   t px  t px  t px   xt dt
0
  1  0.08t 1  0.125t  0.20  dt
1
0
1


 0.2  1  0.205t  0.01t 2 dt
0
1
 0.205t 2 0.01t 3 
 0.2 t 


2
3 0

0.01 

  0.2  1  0.1025 
 0.1802
3 

MLC‐09‐11
121
Question #235
Answer: B
1
d 
 w
G  0.1G  1.50 1  1.06   1000q40
 2.93  q40

AS 
 
 
1  q40
 q40
d

w
 0.9G  1.50 1.06   1000  0.00278   2.93 0.2 
1  0.00278  0.2

0.954G  1.59  2.78  0.59
0.79722
 1.197G  6.22
2
d 
 w

1 AS  G  0.1G  1.50 1  1.06   1000q41  2 CV  q41
AS 
 
 
1  q41
 q41
d


w
1.197G  6.22  G  0.1G  1.50 1.06   1000  0.00298  2 CV  0
1  0.00298  0
 2.097G  7.72 1.06   2.98
0.99702
 2.229G  11.20
2.229G  11.20  24
G  15.8
MLC‐09‐11
122
Question #236
Answer: A
5
1
 2

4 AS  G 1  c4   e4  1  i   1000q x  4  5 CV  q x  4
AS 
1  qx4  qx 4
1


2
 396.63  281.77 1  0.05  7  1  i   90  572.12  0.26
1  0.09  0.26
 657.311  i   90  148.75
0.65
 694.50
 657.311  i   90  148.75   0.65  694.50 
690.18
 1.05
657.31
i  0.05
1 i 
Question #237 - Removed
Question #238 – Removed
MLC‐09‐11
123
Question #239
Answer: B
Let P denote the annual premium
The EPV of benefits is 25, 000 Ax:20  25, 000(0.4058)  10,145 .
The EPV of premiums is Pax:20  12.522 P
The EPV of expenses is
25, 000
 (15  3)  3ax:20
1, 000
 0.20 P  0.6261P  194.025  12  37.566  0.8261P  243.591
 0.25  0.05  P  0.05 P ax:20
  2.00  0.50   0.50 ax:20 
Equivalence principle:
12.522 P  10,145  0.8261 P  243.591
10,389.591
P
12.522  0.8261
 888.31
Question #240
Answer: D
Let G denote the premium.
Expected present value (EPV) of benefits = 1000A40:20
EPV of premiums = G a40:10
EPV of expenses   0.04  0.25  G  10   0.04  0.05  G a40:9  5a40:19
 0.29G  10  0.09G a40:9  5a40:19
 0.2G  10  0.09G a40:10  5a40:19
(The above step is getting an a40:10 term since all the answer choices have one. It
could equally well have been done later on).
MLC‐09‐11
124
Equivalence principle:
G a40:10  1000 A40:20  0.2G  10  0.09G a40:10  5 a40:19


G a40:10  0.2  0.09 a40:10  1000 A40:20  10  5 a40:19
G
1000 A40:20  10  5 a40:19
0.91a40:10  0.2
Question #241 - Removed
Question #242
Answer: C
11
d 
 w

10 AS  G  c10 G  e10  1  i   10,000q x 10  11 CV q x 10
AS 
1  qx10  qx10
d

w
1600  200   0.04  200   70  1.05  10,000  0.02   1700  0.18

1  0.02  0.18
1302.1
0.8
 1627.63
MLC‐09‐11
125
Question #243
Answer: E
The benefit reserve at the end of year 9 is the certain payment of the benefit one
year from now, less the premium paid at time 9. Thus, it is 10,000v – 76.87.
The gross premium reserve adds expenses paid at the beginning of the tenth year
and subtracts the gross premium rather than the benefit premium. Thus it is
10,000v + 5 + 0.1G – G where G is the gross premium.
Then,
10, 000v  76.87  (10, 000v  5  0.9G )  1.67
0.9G  81.87  1.67
0.9G  83.54
G  92.82
Question #244
Answer: C
4
d 
 w

3 AS  G  c4G  e4  1  i   1000q x 3  4 CVq x 3
AS 
1  qx 3  qx 3
d
w
Plugging in the given values:
4 AS


 25.22  30   0.02  30   5 1.05  1000  0.013  75  0.05
1  0.013  0.05
35.351
0.937
= 37.73
MLC‐09‐11
126
With higher expenses and withdrawals:
4 AS
revised

25.22  30  1.2    0.02  30   5  1.05   1000  0.013  75 1.2  0.05 
1  0.013  1.2  0.05 


 48.51.05  13  4.5
0.927
33.425
0.927
= 36.06
4 AS
 4 AS revised  37.73  36.06
= 1.67
Question #245
Answer: E
Let G denote the gross premium.
EPV (expected present value) of benefits  100010 20 A30 .
EPV of premiums  Ga30:5 .
EPV of expenses   0.05  0.25  G  20 first year
  0.05  0.10  G  10  a 30:4 years 2-5
10 5 a35:4 years 6-10 (there is no premium)
 0.30G  0.15G a30:4  20  10 a30:4  10 5 a 30:5
 0.15G  0.15Ga30:5  20  10 a30:9
(The step above is motivated by the form of the answer. You could equally well put it that
form later).
Equivalence principle:
Ga30:5  100010 20 A30  0.15G  0.15G a30:5  20  10 a30:9
G

MLC‐09‐11
1000
10 20 A30
 20  10 a 30:9

 20  10 a30:9

1  0.15 a30:5  0.15
1000
10 20 A30
0.85 a30:5  0.15
127
Question #246
Answer: E
Let G denote the gross premium
EPV (expected present value) of benefits
  0.1 3000  v   0.9  0.2  2000  v 2   0.9  0.8 1000v 2

300 360
720


 1286.98
2
1.04 1.04 1.042
EPV of premium = G
EPV of expenses  0.02G  0.03G  15   0.9  2  v
 0.05G  16.73
Equivalence principle: G  1286.98  0.05G  16.73
1303.71
G
 1372.33
1  0.05
Question #247
Answer: C
EPV (expected present value) of benefits = 3499 (given)
EPV of premiums  G   0.9  G  v
G
0.9G
 1.8571G
1.05
EPV of expenses, except settlement expenses,
  25   4.5 10   0.2 G    0.9  10  1.5 10   0.1G  v   0.9  0.85  10  1.5 10   v 2
0.9  25  0.1G  0.765  25 

1.05
1.052
=108.78+0.2857G
 70  0.2G 
MLC‐09‐11
128
Settlement expenses are 20  110   30 , payable at the same time the death benefit is
paid.
 30 
So EPV of settlement expenses  
 EPV of benefits
 10,000 
  0.003 3499 
 10.50
Equivalence principle:
1.8571G  3499  108.78  0.2857G  10.50
3618.28
G
 2302.59
1.8571  0.2857
Question #248
Answer: D
a50:20  a50  20 E50 a70
 13.2668   0.23047  8.5693
 11.2918
 0.06 
A50:20  1  d a50:20  1  
 11.2918 
 1.06 
 0.36084
Expected present value (EPV) of benefits  10,000A50:20
 3608.40
EPV of premiums  495a50:20
 5589.44
EPV of expenses   0.35  495   20  15 10    0.05  495   5  1.50 10   a50:19
 343.25   44.75 11.2918  1
 803.81
EPV of amounts available for profit and contingencies
= EPV premium – EPV benefits – APV expenses
= 5589.44 – 3608.40 – 803.81
= 1177.23
MLC‐09‐11
129
Question #249
Answer: B
1
1
0
0
q1xy   t pxy  x t dt   t px t p y  x t dt
1
  qx e 0.25t dt (under UDD, t px  x t  qx )
0
1
0.125  qx (4e 0.25t )  qx (4)(1  e 0.25 )  0.8848qx
0
qx  0.1413
Question #250
Answer: C
2
p[11x ]1  p[11x ]1 p[11x ] 2  p[12x ]1 p[21x ] 2
0.1  
0.1  
0.1 
0.2 

  0.7 
  0.7 
   0.3 
 0.4 

2 
3  
2 
3 

 0.75(0.7333)  0.25(0.3333)  0.6333
Note that Anne might have changed states many times during each year, but the
annual transition probabilities incorporate those possibilities.
Questions #251-260 – Removed
Question #261
Answer: A
The insurance is payable on the death of (y) provided (x) is already dead.

E ( Z )  Axy2   e  t t qx t p y  y t dt
0

 e
0.06 t
0
(1  e 0.07 t )e 0.09t 0.09dt

 0.09  e 0.15t  e 0.22t dt
0
1 
 1
 0.09 

  0.191
 0.15 0.22 
MLC‐09‐11
130
Question #262
Answer: C
t
px 
95  x  t
1
,  x t 
,
95  x
95  x  t
t
p y  e  t
Pr(x dies within n years and before y)  
n
0

n
0
t
px t p y  x t dt
n
95  x  t  t
1
1
1  e  n
 t

e
dt 
e
dt
 (95  x)
95  x
95  x  t
95  x 0
Question #263
Answer: A
2
0.25 q30.5:40.5  
0.25
0
t

0.25
0.4
0.6t
dt
1  0.5(0.4) 1  0.5(0.6)
0
p30.5 30.5t t q40.5 dt
0.4(0.6) t 2

0.8(0.7) 2
0.25
 0.0134
0
Question #264 – Removed
Question #265
Answer: D
  t 5rdr   e 2.5t 2

p
exp
t x
 0

0.5t 2
 t

t p y  exp   0 rdr   e


1
1
0
0
1
qx1: y   t p y t px  x t dt   e 0.5t e 2.5t 5tdt  5 e 3t tdt
2
2
0
1
5 2
5
 e 3t  (1  e 3 )  0.7918
6
6
0
MLC‐09‐11
131
2
Question #266
Answer: B
5
G
5
0
1 t
1
t2
dt 

30 25
30(25)(2) 0 60
H  5 p80:85  10 p80:85 
GH 
25 20 20 15 200 4



30 25 30 25 750 15
1 16 17


 0.2833
60 60 60
Question #267
Answer: D
t
t
S0 (t )  exp    (80  x) 0.5 dx   exp  2(80  x)0.5   exp  2((80  t )0.5  800.5 ) 
0
 0


F  S0 (10.5)  exp  2(69.50.5  800.5 )   0.29665
S0 (10)  0.31495
S0 (11)  0.27935
G  S0 (10.5)exp  [0.31495(0.27935)]0.5  0.29662
F  G  0.00003
Question #268
Answer: A
4
4
E ( Z )  500  0.2(1  0.25t )dt  1000  0.25(0.2t )dt
0
0
 500(0.2)  t  0.125t 2   1000(0.25) (0.1t 2 )
4
4
0
0
 100(4  2)  250(1.6)  600
Question #269
Answer: A
10
q30:50  10 q30 10 q50  (1  e 0.5 )(1  e 0.5 )  0.1548
MLC‐09‐11
132
Question #270
Answer: C




e30:50  e30  e50  e30:50

e30  e50   e 0.05t dt  20


0

e30:50   e 0.10t dt  10

0

e30:50  20  20  10  30
Question #271
Answer: B


0
0
1
A30:50
  e  t t p30 t p50 30t dt   e 0.03t e 0.05t e 0.05t 0.05dt 
0.05
 0.3846
0.13
Question #272
Answer: B
T30:50 has the exponential distribution with parameter 0.05 + 0.05 = 0.10 and so its
mean is 10 and its variance is 100.
Question #273
Answer: D

 

Cov[T30:50 , T30:50 ]   e30  e30:50   e50  e30:50   (20  10)(20  10)  100



See solution to Question #270 for the individual values.
Question #274
Answer: E
V  ( 2V   3 )(1  i3 )  qx  2 (b3  3V )
3
96  (84  18)(1.07)  qx  2 (240  96)
qx  2  13.14 /144  0.09125
MLC‐09‐11
133
Question #275
Answer: A
( 3V   4 )(1  i4 )  qx 3b4 (96  24)(1.06)  0.101(360)

 101.05
px 3
0.899
V
4
Question #276
Answer: D
Under UDD:
0.5qx 3
0.5(0.101)

 0.0532
0.5 q x  3.5 
1  0.5qx 3 1  0.5(0.101)
Question #277
Answer: E
V  v 0.5 0.5 p3.5 4V  v 0.5 0.5 q3.5b4
3.5
 1.060.5 (0.9468)(101.05)  1.060.5 (0.0532)(360)
 111.53
Question #278
Answer: D
1  10 p30:40  1  10 p30 10 p40  1 
60 50 2

70 60 7
Question #279
Answer: A
10
2

q30:40
10
0
t
p30 30t (1  t p40 )dt  
10
0
1 t
50
 0.0119
dt 
70 60
70(60)
Question #280
Answer: A

20
10 t

p30 30t t q40 dt  
20
10
20
10 t
p40 40t t q30 dt
20 1 t
1 t
1 400  100 1 400  100
dt  
dt 

 0.0714
10 60 70
70 60
70 2(60)
60 2(70)
MLC‐09‐11
134
Question #281
Answer: C
140, 000
30
t
0
p30 30t t p40 dt  180, 000 
30
0
t
p40 40t t p30 dt
30 1 70  t
1 60  t
dt  180, 000 
dt
0 70 60
0 60 70
1 602  302
1 702  402
 140, 000
 180, 000
 115, 714
70 2(60)
60 2(70)
 140, 000 
30
Question #282
Answer: B
P
20
0

t
p30 t p40 dt  P 
20
0
70  t 60  t
P 20
dt 
4200  130t  t 2 dt

0
70 60
4200
P
[4200(20)  130(200)  8000 / 3]  14.444 P
4200
Question #283
Answer: A
Note that this is the same as Question 33, but using multi-state notation rather
than multiple-decrement notation.
The only way to be in State 2 one year from now is to stay in State 0 and then
make a single transition to State 2 during the year.
1
1
1
p   t p  dt   e
02
x
0
00
x
MLC‐09‐11
02
x t
0
 (0.3 0.5  0.7) t
e 1.5t
1
 (1  e 1.5 )  0.259
0.5dt  0.5
1.5 0 3
135
Question #284
Answer: C
m  1 m2  1

(  80 ) . Then,
2m 12m 2
2  1 22  1
4  1 42  1
(4)



a80(2)  a80
 a80 

(

)

a


(  80 )
80
80
2(2) 12(2) 2
2(4) 12(4) 2
8.29340  8.16715  (1/ 4)  (3 / 8)  [(3 / 48)  (15 /192)](  80 )
(m)
Woolhouse’s formula to three terms is a80
 a80 
0.00125  0.015625(  80 )
  80  0.08
(2)
a80  a80
 1/ 4  (3 / 48)(0.08)  8.5484.
The answer is:
(12)
 a80 
a80
12  1 122  1
11 143

(  80 )  8.54840  
(0.08)  8.08345.
2
2(12) 12(12)
24 1728
Question #285
Answer: B
1
| a70:2  v 2 2 p70  v3 3 p70
 B  x t

c ( c 1)
 At  ln c 
t
p70  e
2
p70  e 0.0002(2) (0.9754483)1.211  0.9943956
3
p70  e0.0002(3) (0.9754483)1.3311  0.9912108
1
e
e
 0.000003  70
t

1.1 (1.1 1)
0.0002 t  ln(1.1) 
e
 e0.0002t (0.9754483)1.1 1
t
| a70:2  0.9943956 /1.052  0.9912108 /1.053  1.7582.
Question #286
Answer: E
1
A50:2
 vq50  v 2 p50 q51
px  e
 B  x

 c ( c 1)
 ln c 
e
 0.000005  x

1.2 (0.2)
 ln(1.2) 
 e 0.0000054848(1.2)
50
p50  0.951311
p51  0.941861
1
A50:2
 0.048689 /1.03  0.951311(0.058139) /1.032  0.09940.
MLC‐09‐11
136
Question #287
Answer: E
The reserve at the end of year 2 is 10, 000vq52   3 where  3 is the benefit premium in
year 3. From the equivalence principle at time zero:
10, 000(vq50  v 2 p50 q51  v 3 p50 p51q52 )  0.5 3  0.5 3vp50   3v 2 p50 p51
0.95 0.95(0.94) 
 0.05 0.95(0.06) 0.95(0.94)(0.07)  



10, 000 
   0.5  0.5
3
2
3
1.04
1.04
1.04
1.042 
 1.04
 
1563.4779  1.78236 3
 3  877.1953
V  10, 000(0.7) /1.04  877.1953  204.12
2
Question #288
Answer: C
The benefit premium in year one is vq50 . By the equivalence principle:
10, 000(vq50  v 2 p50 q51  v 3 p50 p51q52 )  10, 000vq50  (vp50  v 2 p50 p51 )
 0.95(0.06) 0.95(0.94)(0.07)   0.95 0.95(0.94) 
10, 000 




2
1.043
1.042 
 1.04
  1.04
1082.708665  1.739090
  622.5719
2V  10, 000(0.07) /1.04  622.5719  50.51.
Question #289
Answer: E
t-th
year
0*
1
2
3
V
P
E
I
EDB
E tV
0
0
1000
0
0
0
-1000 1.000
0
700
700
14500
14500
14500
100
100
100
864
906
906
14000
15000
16000
690.2
689.5
0
573.8 1.000
316.5 0.986
6 0.971
t 1
Pr
t 1
px
P
1000.0
573.8
312.1
5.8
NPV  1000  573.8v  312.1v 2  5.8v 3  216.08 using a 10% discount rate.
*The 1000 at time 0 is neither accumulated nor discounted. The value is treated
as occurring at the end of time 0 and not as occurring at the beginning of year 1.
MLC‐09‐11
137
Question #290
Answer: C
NPV  140v  0.95(135) p67 v 2  (0.95) 2 (130) 2 p67 v 3  314.09 at a 10% discount rate.
Question #291
Answer: B
Solution
Pr  (6, 000  700  10)(1.06)1/12  0.002(200, 000)  0.0015(50, 000  15, 000)
 0.9965(6, 200)  46.7.
Question #292
Answer: C
245  p40 274 and 300  2 p40 395
Present value of premium:
1000[1  (245 / 274)(1/1.12)  (300 / 395)(1/1.122 )]  2403.821.
Present value of profit:
400  150 / 1.12  245 / 1.12 2  300 / 1.123  142.775.
PV Profit / PV premium = 5.94%
Question #293
Answer: B
P[1  0.97(0.98624)  0.92(0.98624)(0.98499)]
 100, 000[0.97(0.01376)  0.92(0.98264)(0.01501)  0.87(0.98264)(0.98499)(0.01638)]
P  1431.74.
MLC‐09‐11
138
Question #294
Answer: A
Let IF equal 1 if the index drops below its current level in the next year and equals
0 otherwise.
E[ X N | I F  1]  N (1000)vqx  48.54 N
E[ X N | I F  0]  0
E[ X N ]  0.1(48.54 N )  0  4.854 N
Var[ X N | I F  1]  (1000v) 2 Nqx (1  qx )  44, 773.31N
Var[ X N | I F  0]  0
E[Var ( X N | I F )]  0.1(44, 773.31N )  0  4, 477.33 N
Var[ E ( X N | I F )]  0.1(48.54 N ) 2  0  (4.854 N ) 2  212.05 N 2
Var[ X N ]  4, 477.33 N  212.05 N 2
Var ( X 10 )
10
lim
 25.69
Var ( X N )
N 
 lim
N 
N
25.69  14.56  11.13.
4, 477.33 N  212.05 N 2
 212.05  14.56
N
Question #295
Answer: E
The actuarial present value of the death benefit is
S62 (4)d 62(2) v 0.5  S63 (4)d 63(2) v1.5  S64 (4)d 64(2) v 2.5
100, 000
S62l62
 100, 000
3.589(4)(213)v 0.5  3.643(4)(214)v1.5  3.698(4)(215)v 2.5
3.589(52,860)
 4,585.
MLC‐09‐11
139
Question #296
Answer: A
Policy 1:
AV371  [ AV36  G  E  (100, 000  AV371 ) 1/12 q63 /1.004](1.004)
 ( AV36  G  E )1.004  100, 000 1/12 q63  AV371 1/12 q63
 [( AV36  G  E )1.004  100, 000 1/12 q63 ] / (1  1/12 q63 )
Policy 2
AV372  [ AV36  G  E  100, 000 1/12 q63 /1.004](1.004)
 ( AV36  G  E )1.004  100, 000 1/12 q63
Because the starting account value, G and E are identical for both policies:
AV361 / AV362  1/ (1  1/12 q63 )  1 / [1  (1 / 12)(0.01788)]  1.0015.
Question #297
Answer: E
The recursive formula for the account values is:
AVk 1  ( AVk  0.95G  50)1.06  (100, 000  AVk 1 )q50 k .
This is identical to the recursive formula for benefit reserves for a 20-year term
insurance where the benefit premium is 0.95G – 50. Because the benefit reserve
is zero after 20 years, using this premium will ensure that the account value is zero
after 20 years. Therefore,
0.95G  50  100, 000
1
A50:20
A  E A
0.24905  0.23047(0.51495)
 50 20 50 70  100, 000
 1154.55
13.2668  0.23047(8.5693)
a50:20
a50  20 E50 a70
G = (1154.55+50)/0.95 = 1,267.95.
MLC‐09‐11
140
Question #298
Answer: A
2
 5, 000 
E ( Z )  (5, 000 /1.030) (0.005)  
 (1  0.005)(0.006)
1.030(1.032) 
2
2
2


5, 000

 (1  0.005)(1  0.006)(0.007)
1.030(1.032)(1.035) 
 392,917
Question #299
Answer: E
44.75  0.00004(1.144.75 )  0.002847
44.5  0.00004(1.144.5 )  0.002780
1000  E ( 4.75 L)  0.25{0.04 E ( 4.75 L)  150  150(0.05)  0.002847[10, 000  100  E ( 4.75 L)]}
E ( 4.75 L)  {1000  0.25[150  150(0.05)  0.002847(10, 000  100)]} / [1  0.25(0.04  0.002847)]
 961.27
961.27  E ( 4.5 L)  0.25{0.04 E ( 4.5 L)  150  150(0.05)  0.002780[10, 000  100  E ( 4.5 L)]}
E ( 4.5 L)  {961.27  0.25[150  150(0.05)  0.002780(10, 000  100)]} / [1  0.25(0.04  0.002780)]
 922.795
Question #300
Answer: B
Assumed profit = 990*[(100 + 90 – 90*0.030)*(1.05) – 0.003*10,000 – (1 –
0.003)*125] = 41,619.60
Actual profit = 990*[(100 + 90 – 90*0.025)*(1.04) – 0.002*10000 – (1 – 0.002)*125]
= 50,004.90
Total gain from mortality, interest and expense = 50,004.90 – 41,619.60 =
8,385.30.
MLC‐09‐11
141