numbers 1-4, refer to the following frequency table.

Classes f x fx ̅ − ̅ ( − ̅)

2

( − ̅) ( −

̅)

2

21-30 4 25.5 102 45 -19.5 380.25 78 1521

31-40 6 35.5 213 45 -9.5 90.25 57 541.5

41-50 2 45.5 91 45 0.5 0.25 1

0.5

51-60 3 55.5 166.5 45 10.5 110.25 31.5 330.75

61-70 5 65.5 327.5 45 20.5 420.25 162.5 2101.25

Total N = 20 900 4495

1. What is the range of the given data set?

A. 45 C. 55

B. 50 D. 40

2. What is the average deviation of the given data set?

A. 12.5 C. 14.5

B. 13.5 D. 15.5

3. What is the population variance of the given data set?

A. 222.75 C. 224.75

B. 223.25 D. 225.25

4. What is the population standard deviation of the given data set?

A. 14.99 C. 14.09

B. 15.79 D. 15.69

5. What is the sample variance of the given data set?

A. 250.41 C. 252.43

B. 251.61 D. 253.63

6. What is the sample standard deviation of the given data set?

A. 15.86 C. 15.64

B. 15.75 D. 15.538. What is the average deviation of the given data set?

A. 2 C. 6

B. 4 D. 8

9. What is the population variance of the given data set?

A. 5.67 C. 6.63

B. 3.76 D. 4.67

10.What is the population standard deviation of the given data set?

A. 2.61 C. 2.16

B. 2.26 D. 2.21

11.What is the sample variance of the given data set?

A. 5.8 C. 5.5

B. 5.6 D. 5.7

12.What is the sample standard deviation of the given data set?

A. 2.35 C. 2.37

B. 3.35 D. 2.33

13.If the range of a set of scores is 10 and the lowest score is 6, what is the

highest score?

A. 16 C. 14

B. 17 D. 15

14.What is the most reliable measure of variability?

A. range C. average deviation

B. variance D. standard deviation

15.What should be the divisor if given data set is an entire population?

A. n C. n+1

B. n-1 D. none of these

For numbers 7-12, Ricky did a survey of the number of mobile games played by his

classmates, with the following results: {1, 2, 7, 3, 5, 6}

7. What is the range of the given data set?

A. 5 C. 6

B. 7 D. 4 8. What is the average deviation of the given data set?

A. 2 C. 6

B. 4 D. 8

9. What is the population variance of the given data set?

A. 5.67 C. 6.63

B. 3.76 D. 4.67

10.What is the population standard deviation of the given data set?

A. 2.61 C. 2.16

B. 2.26 D. 2.21

11.What is the sample variance of the given data set?

A. 5.8 C. 5.5

B. 5.6 D. 5.7

12.What is the sample standard deviation of the given data set?

A. 2.35 C. 2.37

B. 3.35 D. 2.33

13.If the range of a set of scores is 10 and the lowest score is 6, what is the

highest score?

A. 16 C. 14

B. 17 D. 15

14.What is the most reliable measure of variability?

A. range C. average deviation

B. variance D. standard deviation

15.What should be the divisor if given data set is an entire population?

A. n C. n+1

B. n-1 D. none of these
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