Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 39

Marketing: Age What is the age distribution of promotion-sensitive shoppers A supermarket super shopper is defined as a shopper for whom at least 70% of the items purchased were on sale or purchased with a coupon. The following table is based on information taken from Trends in the United States (Food Marketing Institute. Washington, D.C.).

For the 62-and-over group, use the midpoint 67 years.
(a) Using the age midpoints x and the percentage of super shoppers, do we have a valid probability distribution Explain.
(b) Use a histogram to graph the probability distribution of part (a).
(c) Compute the expected age of a super shopper.
(d) Compute the standard deviation for ages of super shoppers.