2.54 How much time (in minutes) do people spend on a typical visit to a local mall? A random sample of n = 104 shoppers was timed and the results (in minutes)

are stored in the data file Shopping Times.

You were asked to describe graphically the shape of the distribution of shopping times in Exercise 1.72

(Chapter 1). Now describe the shape of the distribution numerically.

a. Find the mean shopping time.

b. Find the variance and standard deviation in shopping times.

c. Find the 95th percentile.

d. Find the five-number summary.

e. Find the coefficient of variation.

f. Ninety percent of the shoppers completed their shopping within approximately how many minutes?