Chapter 7 Quiz

1. 1. The probability of an event is 84%. Describe the likelihood of the event.

• Very unlikely

• Unlikely

• Likely

• Certain

2. 2. You randomly draw a marble from a bag, record its color, and then replace it. You draw a red marble 7 out of 25 times. What is the experimental probability that the next marble will be red?

• 0.28

• 0.25

• 0.30

• 0.32

3. There are 4 green marbles and 7 silver marbles in a bag. You randomly choose one of the marbles. What is the probability of choosing a green marble?

• 1/11

• 4/11

• 7/11

• 4/7

4. Use the table to predict the number of times you will spin 1 when you spin the spinner 100 times.

• 18

• 20

• 22

• 24

5. 5. What is the theoretical probability of randomly choosing a vowels?

• 1/7

• 3/7

• 2/7

• 7/1

6. 6. How many times can you expect to not draw a point card in 25 turns?

• 20 times

• 5 times

• 10 times

• 15 times

7. 7. A group of five sixth-graders measure and record their weights. The weights (in pounds) are 99, 70, 82, 98, and 76. Find the mean and the median of the weights.

• Mean: 85, Median: 82

• Mean: 85, Median: 76

• Mean: 85, Median: 98

• Mean: 85, Median: 99

8. 8. Find the mode of the data set 54, 57, 56, 58, 55, 57, 60, 59, 57, and 56.

• 54

• 56

• 57

• 58

9. Removing an outlier results in the data set shown. Removing the outlier decreased the mean by 1.5. What was the value of the outlier? 12, 13, 14, 11, 16, 13, 18, 15, 14

• 10

• 20

• 25

• 30

10. 10. The table shows the weights of several African elephants. Determine which measure of center best represents the data. Then answer the statistical question, “What is the weight of an African elephant?”

• Mean

• Median

• Mode

• Range