NAME _____________________________________________ DATE ____________________________ PERIOD _____________
7th Grade Pre-AP
Review WS- Probability
1. If a pair of number cubes is rolled, what is the
probability of getting doubles?
6. A bag contains 5 green marbles, 3 blue marbles,
and 2 red marbles. What is the probability that
one marble drawn at random will not be blue?
2. Julia has a box of 8 red buttons and 6 blue
buttons. She randomly selected one button, took
it out of the box, then selected another button.
What is the probability that both buttons are red?
7. If a number cube is rolled three times, what is
the probability that it will land on a 2 each time?
For Exercises 8-10, use the spinner shown. Determine
the probability of each event. Write as a fraction in
simplest form.
3. Determine if the event is independent or
dependent: The students in gym class each pick
lockers for their own use. Kristina picks her
locker and then Alexandra picks her locker.
4. Find the probability of getting a sum of 7 when
two number cubes are tossed.
8. P(even number)
9. P(prime number)
5. A coin and dice are tossed. How many outcomes
are there?
10. P(not 4)
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16. Abigail tossed a coin 15 times. The results were
9 heads and 6 tails. Find the probabilities below:
For Exercises 11-14, determine the total number of
outcomes in each sample space.
11. picking a day of the week and rolling a number
cube labeled 1–6
a) Theoretical probability of tails
b) Experimental probability of tails
12. picking a marble from bag containing blue,
yellow, and green and tossing a dime
17. What is the probability that Louise’s spinner will
land on blue and she will roll a 4?
13. choosing an hour of the day and a day of the
week
18. A bag contains 2 red crayons, 4 blue crayons,
and 1 green crayon. A crayon is selected, kept
out of the bag, and then another crayon is
selected. What is P(blue, then green)?
14. choosing a shirt from long sleeve, short sleeve,
or tank top, bottoms from shorts, pants, or
capris, and footwear from sandals, boots, or gym
shoes
19. Anne must select a colored ball from a bag. The
bag contains 2 red balls, 1 blue ball, 1 green ball,
3 orange balls, and 2 yellow balls. Predict her
chances of selecting a blue ball.
15. A teacher is handing out pencils: red, blue, or
yellow. Each pencil is equally likely to be
handed out. Which simulation could be used to
model this situation?
a) Tossing a coin
b) Spin a fair spinner with 4 sections
c) Spin a fair spinner with 3 sections
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ANSWER KEY
1. 1/6
2. 4/13
3. Dependent
4. 1/6
5. 12
6. 7/10
7. 1/216
8. ½
9. ½
10.7/8
11. 42
12.6
13.168
14.27
15.C
16. a) ½
b) 2/5
17. 1/24
18. 2/21
19.1/9