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. Age range, years 18-28 29-39 40-50 51-61 62 and over Midpoint x 23 34 45 56 67 Percent of super shoppers 6% 47% 21% 11% 15%   a) Compute the expected age ? of a super shopper. (Round your answer to two decimal places.) ? =  yr   b) Compute the standard deviation ? for ages of super shoppers. (Round your answer to two decimal places.) ? =  yr

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 19E
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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.
Age range, years 18-28 29-39 40-50 51-61 62 and over
Midpoint x 23 34 45 56 67
Percent of super shoppers 6% 47% 21% 11% 15%

 

a) Compute the expected age ? of a super shopper. (Round your answer to two decimal places.)
? =  yr
 
b) Compute the standard deviation ? for ages of super shoppers. (Round your answer to two decimal places.)
? =  yr
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Swokowski
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