In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66.

What is the mean?

A. 73.0

B. 72.0

C. 71.5

D. 71.0

E. 77.0 Compute the population variance of these data: 16,18,23,21,17,16,24,23,9, 17,11,16,22,10,15,14.

A. 3.625

B. 3.87

C. 17.0

D. 20.5

E. 21.9 In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are (mean = 70): 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68.

What is the variance?

A. 22.40

B. 18

C. 324

D. 6.76

E. 4.73 The random variable x has a hypergeometric distribution, and the population contains 12 items. If you wanted to find the number of defects in a random sample of 3 selected items when the population contains 5 defects, identify the N, n, and r.

A. N = 3, n = 12, r = 5

B. N = 5, n = 12, r = 7

C. N = 12, n = 5, r = 3

D. N = 12, n = 3, r = 5