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Unit 11 Probability Study Guide
Choose the best answer.
1. A sample space consists of 18 separate events that are equally likely. What is the
probability of each?
A 0
B 1
1
18
C
D 18
2. On a multiple-choice test, each question has 5 possible answers. What is the
probability that a random guess on the first question will be correct?
A 0
B 1
C
1
5
D
5
3. Walt spun a spinner 100 times. The results are shown in the table. What
is the experimental probability of spinning a red on the next spin?
Outcome Red Blue Yellow Green
Number
of spins
A
1
20
20
28
31
B
1
5
21
1
10
C
D
4
5
4. What is the probability that a multiple of 1 will occur with one roll of a fair number
cube?
A
1
2
B 1
5. Kelly has 200 red and green beads in a bag. If there are 70 red beads, what is the
probability of randomly selecting a red bead?
A 35%
B 70%
6. A bag contains 5 green candles, 2 yellow candles, and 3 red candles. What is the
probability of picking a red candle and then a green candle from the bag without
replacement?
A
3
20
B
1
6
7. If you flip a coin and land 3 heads in a row, what is the probability of landing heads
on the next flip?
A 0
B
1
2
C
1
4
D
1
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8.Margaret has a bag containing 5 red chips and 5 blue chips. What is the probability of
drawing two red chips in two draws without replacement?
A
2
9
B
1
2
9.A spinner has 4 equal divisions, numbered 1 to 4. Predict how many times an even
number is likely to occur in 100 spins.
A 25
B 75
C
50
D
100
10. Last week the cafeteria sold 80 sandwiches, 150 salads, and 70 mini-pizzas. If the
order for next week includes 400 lunches, how many salads are likely to be sold?
A 150
B 275
C
200
D
300
11. James decides to make a cheese sandwich. He finds 2 types of bread and 3 kinds
of cheese. How many different sandwich choices does he have with one kind of
cheese on one kind of bread?
A 2
B 6
C
3
D
9
12. A sample space consists of 109 separate events that are equally likely. What is the
probability of each?
A 0
B 1
C
1
109
D
109
13. A number cube is rolled. If rolling each face is equally likely, what is the probability
of rolling a number greater than 2?
F
1
6
G
2
3
H
1
3
J
4
D
1.00
14. Based on the probability table below, determine P(not B).
A
Outcome
Probability
B
C
D
0.35 0.22 0.20 0.23
A 0.22
B 0.78
C
0.65
15. An experiment consists of drawing a random card from a pack of cards with
symbols. The experiment is repeated 150 times with the results shown on the table.
Estimate the experimental probability that the next draw will be a star.
Symbol Star Circle Square Line
Draws
F 0.25
72
34
16
28
G 0.50
H
0.48
J
0.72
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16. Walt spun a spinner 120 times. The results are shown in the table. What
is the experimental probability of spinning a red on the next spin?
Outcome Red Blue Yellow Green
Number
of spins
A
1
10
14
28
31
B
47
1
4
C
7
60
D
1
17. What is the probability that a multiple of 2 will occur with one roll of a fair number
cube?
F
1
6
G
5
6
H
1
2
J
1
18. A bag contains a mixture of 350 red and 78 yellow candies. If you choose one
candy at random what is the probability, to the nearest percent, that it is yellow?
A 18%
B 50%
C
22%
D
82%
19. A bag of letter tiles contains 5 As, 3 Bs and 2 Cs. What is the probability of picking
ABC in order in three draws from the bag, without replacement?
F
3
100
G
1
12
H
1
24
J
1
2
20. If you flip a coin, landing 5 heads in a row, what is the probability of landing heads
on the next flip?
A 0
B
1
2
C
1
5
D
1
21. Margaret has a bag containing 5 red chips and 5 blue chips. What is the probability
of drawing two red chips in two draws without replacement?
F
2
10
G
1
4
H
2
9
J
17
18
22. A spinner has 8 equal divisions, numbered 1 to 8. How many times will an even
number occur in 120 spins?
A 15
B 60
C
50
D
120
23. The school store sells 15 red, 107 blue, and 28 purple pens. If they purchase 500
more pens, how many red pens should they order?
F 10
G 50
H
15
J
75
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
189
Holt McDougal Mathematics
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
190
Holt McDougal Mathematics