Name ______________________________
12-3 and 12-4 Practice
 For each problem, classify each scenario as either experimental (E) or theoretical (T) probability.
1) ________ There are 14 girls and 18 boys in Miss Wiley’s class. Miss Wiley needs to randomly select one
student to solve a problem. She says the probability of selecting a girl is
.
2) ________ A spinner has 5 equally likely outcomes, labeled 1 through 5. After spinning 40 times, Sara
determined her probability of landing on 4 was
.
3) ________ A spinner has 8 equally likely outcomes, labeled 1 through 8. Danny determined the probability
of spinning a number less than 7 is .
 Solve each problem.
4) There are 6 yellow cards, 4 blue cards, and 10 green cards in a bag. A card is chosen at random.
i.
What is the probability of choosing a yellow card? Write the probability as a decimal.
ii.
What is the probability of choosing a blue or green card? Write the probability as percent.
iii.
What is the probability of the complement of choosing a blue card? Write the probability as a fraction.
iv.
If Dustin chose a card at random 100 times, how many times could he expect to draw a blue card?
v.
If Jennifer chose a card at random 50 times, how many times could she expect to draw a card that is
NOT green?
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
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5) Ethan hits 4 ringers in 10 attempts while pitching horseshoes.
What does an experimental probability of describe?
a) P(horseshoes)
b) P(missed shots)
c) P(attempts)
d) P(ringers)
6) Nathan inspects new pants at a factory. Out of the first 9 pairs of pants he inspected, 7 were acceptable.
Out of 81 pairs of pants, how many pairs can Nathan expect to be NOT acceptable?
7) Simon spins the spinner shown below.
If Simon spins the spinner once, what is the probability it will land on a multiple of 3?
Write the probability as a fraction.
8) Find the probability of randomly drawing a vowel from a bag of 100 Scrabble® tiles that has 12 E’s, 9 I’s, 8
O’s, 4 U’s, and 2 A’s. Write the probability as a fraction, decimal, and percent.
9) Kendra determines that the probability of her making a free throw is . If she attempts 30 free throws at
practice, how many free throws can Kendra expect NOT to make?
10) Using radar, a police officer determined that 20% of cars in a particular neighborhood drive above the
speed limit of 35 mph. Out of the next 40 cars the police officer radars, how many cars can he expect to
be traveling at or below the speed limit?
11) Stanley is reading a 224-page book. There are illustrations on 14 pages. If Stanley opens the book at
random, what is the probability that the page will have an illustration?
a) 0.0004
c) 0.0714
b) 0.0625
d) 0.9375
12) Courtney plays a game using a spinner like the one shown below.
Which event or complement has a probability of ?
a)
b)
c)
d)
P(white)
P(NOT white or yellow)
P(yellow or green)
P(NOT black)