Shown below are the top food and drug stores in the United States in a recent year according to Fortune magazine.

Company Revenues ($ billions)

Kroger ...........66.11

Walgreen ..........47.41

CVS/Caremark .......43.81

Safeway ...........40.19

Publix Super Markets .....21.82

Supervalu .........19.86

Rite Aid ...........17.27

Winn-Dixie Stores ....... 7.88

Assume that the data represent a population.

a. Find the range.

b. Find the mean absolute deviation.

c. Find the population variance.

d. Find the population standard deviation.

e. Find the interquartile range.

f. Find the z score for Walgreen.

g. Find the coefficient of variation.