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Math 7
Study Island Review
PROBABILITY
Name:___________________________________
1. Thirty slips of paper, numbered 1 to 5, are placed in a paper bag. One slip of paper is
drawn at random.
What is the probability of drawing an even number?
A.
B.
C.
D.
2.
What is the probability of the spinner landing on red?
A.
B.
C.
D.
3. Tyrone randomly drew pieces of paper numbered 10 through 50 out of a bowl. After he
drew each piece of paper, he recorded the number, returned the piece of paper to the bowl,
and then drew the next piece of paper. His results are recorded in the stem-and-leaf plot
below.
1
2
3
4
1
0
0
3
1
1
0
4
2
2
1
4
3
2
2
5
4
2
3
6
4
3
4
7
5
4
5
8
7
6
5
8
8
8 9
6 7 9 9
9
Key: 1 6 represents 16
Based on the information in the stem-and-leaf plot, what is the experimental probability that
a piece of paper randomly drawn from the bowl will have the number 35 written on it?
A.
B.
C.
D.
4. Maya drew one highlighter at a time from a container of highlighters. After each draw, the
highlighter was replaced.
Maya recorded the results of 20 draws in the table below.
Draw Result Draw Result Draw Result Draw Result
1
blue
6
purple
11
orange
16
yellow
2
pink
7
orange
12
pink
17
purple
3
purple
8
blue
13
yellow
18
blue
4
orange
9
orange
14
purple
19
orange
5
blue
10
purple
15
orange
20
pink
What is the experimental probability of drawing a blue highlighter?
A.
B.
C.
D.
5. Nine cards with varying symbols, lowercase letters, capital letters, and numbers are placed
in a paper bag. One card is drawn at random.
What is the probability of drawing a number?
A.
B.
C.
D.
6. Becky has a cup of pens, pencils, and stick erasers on her desk.
If Becky picks one of these objects randomly from the cup, what is the probability she will
pick a stick eraser?
Key
Pencils:
Pens:
Eraser:
A.
B.
C.
D.
7. A spinner with nine equal-sized sections numbered one to nine is spun once. What is the
probability that the spinner will land on a number that is not a multiple of three?
A.
B.
C.
D.
8. The possible outcomes for rolling a pair of fair dice are shown below.
What is the probability of rolling a sum that is a multiple of three?
A.
B.
C.
D.
9. The letters needed to spell "probability" are placed in a bag.
P, R, O, B, A, B, I, L, I, T, Y
What is the probability that a "B" will be drawn from the bag?
A.
B.
C.
D.
10. The possible outcomes for tossing a coin four times are shown below.
1. T-T-T-T
2. T-T-T-H
3. T-T-H-T
4. T-T-H-H
5. T-H-T-T
6. T-H-T-H
7. T-H-H-T
8. T-H-H-H
Tails = T
9. H-T-T-T
10. H-T-T-H
11. H-T-H-T
12. H-T-H-H
13. H-H-T-T
14. H-H-T-H
15. H-H-H-T
16. H-H-H-H
Heads = H
If a coin is tossed four times, what is the probability of getting exactly zero heads?
A.
B.
C.
D.
11. A bag of balloons contains 5 red balloons, 13 green balloons, 17 yellow balloons, and
8 orange balloons. What is the probability that a randomly selected balloon would be green
or orange?
A.
B.
C.
D.
12. Fill in the blank.
The probability of a chance event is a number between 0 and ___ that expresses the
likelihood of the event occurring.
A.
B.
C.
D.
13. Marty has a jumble of socks in his drawer. If he picks a pair of socks randomly from his
drawer, what is the probability Marty will pick a blue pair of socks?
Each set of two socks is a pair.
b = blue, r = red, g = gray
A.
B.
C.
D.
14.
Eden spun the above spinner 12 times, and recorded the results in the table below.
Spin Result Spin Result Spin Result
1
4
5
6
9
1
2
7
6
3
10
4
3
1
7
2
11
7
4
8
8
4
12
10
What is the experimental probability of spinning an 8?
A.
B.
C.
D.
15. Kellie did an experiment where she flipped a coin 25 times. The results are recorded in
the table below.
Flip Result Flip Result Flip Result Flip Result Flip Result
1
H
6
T
11
T
16
T
21
T
2
H
7
T
12
H
17
T
22
H
3
T
8
H
13
T
18
H
23
T
4
T
9
T
14
H
19
T
24
T
5
H
10
T
15
H
20
T
25
H
What is the experimental probability of the coin landing on tails?
A.
B.
C.
D.
Answers
1. D
2. D
3. B
4. C
5. C
6. B
7. C
8. B
9. B
10. B
11. C
12. B
13. A
14. C
15. D