Math 7



Math 7 Name:___________________________________

Study Island Review

PROBABILITY

[pic]

1. Thirty slips of paper, numbered 1 to 5, are placed in a paper bag. One slip of paper is drawn at random.

[pic]

What is the probability of drawing an even number?

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[pic|

|c] | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

2.

[pic]

What is the probability of the spinner landing on red?

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

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 |[|1   1   2   3   4   4   5   7   8 |

| |p| |

| |i| |

| |c| |

| |]| |

|2 | |0   1   2   2   2   3   4   6   8   9 |

|3 | |0   0   1   2   3   4   5   5   6   7   9   9 |

|4 | |3   4   4   5   6   7   8   8   9 |

|Key:  |1 |[|6 | represents 16 |

| | |p| | |

| | |i| | |

| | |c| | |

| | |]| | |

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?

|[pi|A. |[pic|

|c] | |] |

|[pi|B. |[pic|

|c] | |] |

|[pi|C. |[pic|

|c] | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

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.

|Dra|Res|Dr|

|w |ult|aw|

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[pic|

|c] | |] |

[pic]

5. Nine cards with varying symbols, lowercase letters, capital letters, and numbers are placed in a paper bag. One card is drawn at random.

[pic]

What is the probability of drawing a number?

|[pi|A. |[pic|

|c] | |] |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

6. Becky has a cup of pens, pencils, and stick erasers on her desk.

[pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]  [pic]

If Becky picks one of these objects randomly from the cup, what is the probability she will pick a stick eraser?

|Key |

|Pencils: |

| |

|[pic]  [pic] |

|Pens: |

| |

|[pic]  [pic] |

|Eraser: |

| |

|[pic] |

| |

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

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?

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

8. The possible outcomes for rolling a pair of fair dice are shown below.

[pic]

What is the probability of rolling a sum that is a multiple of three?

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[pic|

|c] | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

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?

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[pic|

|c] | |] |

|[pi|C. |[pic|

|c] | |] |

|[pi|D. |[pic|

|c] | |] |

[pic]

10. The possible outcomes for tossing a coin four times are shown below.

|1. T-T-T-T | |5. T-H-T-T | |9. |H-T-T-T | |13. H-H-T-T |

|2. T-T-T-H | |6. T-H-T-H | |10. |H-T-T-H | |14. H-H-T-H |

|3. T-T-H-T | |7. T-H-H-T | |11. |H-T-H-T | |15. H-H-H-T |

|4. T-T-H-H | |8. T-H-H-H | |12. |H-T-H-H | |16. H-H-H-H |

|Tails = T    Heads = H |

If a coin is tossed four times, what is the probability of getting exactly zero heads?

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[pic|

|c] | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[pic|

|c] | |] |

[pic]

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?

|[pi|A. |[pic|

|c] | |] |

|[pi|B. |[pic|

|c] | |] |

|[pi|C. |[pic|

|c] | |] |

|[pi|D. |[pic|

|c] | |] |

[pic]

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.

|[pi|A. |[p|

|c] | |ic|

| | |] |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[pic]|

|c] | | |

|[pi|D. |[pic|

|c] | |] |

[pic]

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?

[pic][pic][pic][pic][pic]

[pic][pic][pic][pic][pic]

Each set of two socks is a pair.

b = blue, r = red, g = gray

|[pi|A. |[pic|

|c] | |] |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

14.

[pic]

Eden spun the above spinner 12 times, and recorded the results in the table below.

|Spi|Res|Spin|

|n |ult| |

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[pic|

|c] | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

15. Kellie did an experiment where she flipped a coin 25 times. The results are recorded in the table below.

|Fli|Res|Fl|

|p |ult|ip|

|[pi|B. |[p|

|c] | |ic|

| | |] |

|[pi|C. |[p|

|c] | |ic|

| | |] |

|[pi|D. |[p|

|c] | |ic|

| | |] |

[pic]

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

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download