Shown below are the top food and drug stores in the United States in a recent year according to Supermarket News and Chain Drug Review.

Company .......Revenues ($ billions)

Walmart ........258.5

Kroger ........ 77.2

Costco........ 72.5

Walgreens........ 63.3

CVS Caremark ...... 49.0

Supervalu ........ 45.0

Safeway ........ 44.8

Loblaw ........ 31.5

Rite Aid ........ 26.3

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 inter-quartile range.

f. Find the z score for Walgreens.

g. Find the coefficient of variation.