Concept explainers
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.).
Age |
18-28 | 29-39 | 40-50 | 51-61 | 62 and over |
Midpoint x | 23 | 34 | 45 | 56 | 67 |
Percent of super shoppers | 7% | 44% | 24% | 14% | 11% |
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
(b) Use a histogram to graph the probability distribution of part (a).
(c) Compute the expected age
(d) Compute the standard deviation
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Chapter 6 Solutions
Understanding Basic Statistics
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