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Date
Name
Class
Practice B
These are the results of the last math test. The teacher determines
that anyone with a grade of more than 70 passed the test. Give the
probability for the indicated grade.
Grade
# af Qtr
rdante
v\gev.l.!
iM
1. P(70)
5. P(grade >
2.
80)
I
65
70
80
90
100
(
e
't,
1n
2
I
P(100)
3. P(80)
6. P(60)
7.
4. P(passing)
P(failing)
8. P(grade
-
80)
A bowling game consists of rolling a ball and knocking up
to 5 pins down. The number of pins knocked down are then
counted. The table gives the probability of each outcome.
Number of Pins Down
Probability
0
1
2
3
4
5
0.175 0.189 o.264 0.205 0.132 0.035
9. What is the probability of knocking down all 5 pins?
10. What is the probability of knocking down no pins?
11. What is the probability of knocking down at most 2 pins?
12. What is the probability of knocking down at least 2 pins?
13. What is the probability of knocking down more than 3 pins?
Copyright @ by Holt. Rinehart and Wnston
All righls reserved.
4
Holt Mathematics
P9l
Date
Practice
Building Skills
i
Write each probability as a fraction'
Ronaldo flips 2 coins' Find the probability
of t head and I tail'
1.
i:
'!!|
2, '
You
roll 1 number
cube to show an odd
tl
::
number.
,i
I
t,
Sheila has 8 apples; 5 of them are red'
3.
s,ff t*o of 6 CDs are scratched'
7
.
4,
O;f L}books,3 ard fiction.
6.
Nine out of 10 teen's like to shop'
8,
You can preselect 6 radio stations in your
car. You hit a button without looking'
What is the probability that it is your
favorite station?
There are 3,side orders: French fries' baked
potato, or mashed potatoes' Find the
probability of a customer choosing a
baked Potato.
Problem Solving
Find the probabilitY.
9.
I
i.
.
Daniel flips 2 coins. Find the probability of
the coins both coming uP heads'
1O,
with 10 breakfast
1
of them is her
that
knows
bars. She
favorite. Find the probabilitythat she will
select her favorite bar by reaching into the
bag without looking'
12.
]acquie has 4 sweaters that go with her
new jeans. What is the probability that she
will pick the white one out of her cioset?
as he
]oe puts 5 bool<s in his backpack
leaves for school. He has 2 math books' 1
is
science book, and} historybooks' What
the probability that he will grab his science
boot out of his backpackwithout looking?
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@ Harcou* Ac*rieve lnc. All rigihts resewed'
Serena has a bag filled
?1v
75
Lesson 33
Pre-Algebra, Data Analysis, and Probability' SV 01138-7
_-r
Date
r-LEJsoN-
Class
Practice A
The results of an unbiased survey show the favorite instruments of
8th graders. Estimate the probability of each.
Result
Number
Piano
Drums
Trombone
Flute
Violin
Clarinet
1
4
42
38
12
3
1. a student chooses clarinet
2. a student chooses drums
3. a student chooses flute
4. a student chooses piano
5. a student chooses
trombone
6. a student chooses violin
A can contains color chips in 5 different colors. Thomas took a
sample from the can and counted the colors. His results are in
the table below.
Color
Number
Blue
Pink
Black
White
Green
10
5
20
30
15
7. Use the table to compare the probability that Thomas
chooses a pink color chip to the probability that he chooses
a white color chip.
8. Use the table to compare the probability that Thomas chooses
a green color chip to the probability that he chooses a blue color chip.
9. Cheryl surveyed 30 students who ride the bus to school, 8 who
walk, 9 who ride bicycles, and 3 who ride in cars. Estimate the
probability that the next student Cheryl surueys will
walk to school.
Copyright @ by Holt, Flinehart and Winston.
All rights reserved.
12
Holt Mathematics
p59
Date
Practice
Building Skills
Write the experimental probability as a percentage'
1.
A coin is flipped
heads 9 times.
12
2.
times.It comes up
A'coin is flipped 40 times. It lands headsup 16 times.
1:
.;l"i
'.i
3,
5.
4.
A number cube is rolled 20 times.It
shows a4frvetimes.
u
15 times.
It lands on
green 6 times.
6.
ro*.y
of .L25 students, J5 say math
is their favorite subject.
11{
A spinner is turned
In a group of neighbors on Elm Street,
out of 20 prefer Wednesday for trash
16
collection.
7
.
8.
]eff chose a marble 20 times without
looking and replaced the marbie each time'
He drew a white marble 12 times'
On one day in a hosPital, there are
24 single births. Of these, 16 are boys'
Prob[em Solving
Solve using experimental probability.
9.
1O,
George surveyed some people about traffic
by asking who was in favor of a traffic light
at a certain corner. Of the 40 people he
each time for a total
times. She pic}s oats 4 times.
repiaces
surveyed,24 supported a traffic light'
1
1.
Lai Jun turned a game spinner 3 times'
landed on "skip a turn" three times.
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@ Harcourt Achieve lnc. All rights resewed'
Shonda has a variety pack of 8 boxes of
cereal. She chooses 1 box at a time and
12.
It
81
it
of
10
The class voted on a fi.eld trip 2 times.
Fourteen students wanted to go to the
Ancient Egfpt exhibit and 72 wanted to
go to the dirot"ot exhibit.
Pre-Agebra, Data Analysis, and Probability,
SiH:t:?
n4