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 10% 47% 23% 9% 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 probability distribution? pick correct answer: -No. The events are indistinct and the probabilities sum to more than 1 -No. The events are distinct and the probabilities sum to 1. -Yes. The events are distinct and the probabilities do not sum to 1. -Yes. The events are distinct and the probabilities sum to 1. -Yes. The events are indistinct and the probabilities sum to less than 1. b) Compute the expected age ? of a super shopper. (Round your answer to two decimal places.) ? = yr c) Compute the standard deviation ? for ages of super shoppers. (Round your answer to two decimal places.) ? = yr
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 10% 47% 23% 9% 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 probability distribution? pick correct answer: -No. The events are indistinct and the probabilities sum to more than 1 -No. The events are distinct and the probabilities sum to 1. -Yes. The events are distinct and the probabilities do not sum to 1. -Yes. The events are distinct and the probabilities sum to 1. -Yes. The events are indistinct and the probabilities sum to less than 1. b) Compute the expected age ? of a super shopper. (Round your answer to two decimal places.) ? = yr c) Compute the standard deviation ? for ages of super shoppers. (Round your answer to two decimal places.) ? = yr
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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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 |
18-28 | 29-39 | 40-50 | 51-61 | 62 and over |
|---|---|---|---|---|---|
| Midpoint x | 23 | 34 | 45 | 56 | 67 |
| Percent of super shoppers | 10% | 47% | 23% | 9% | 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 probability distribution? pick correct answer:
-No. The events are indistinct and the probabilities sum to more than 1
-No. The events are distinct and the probabilities sum to 1.
-Yes. The events are distinct and the probabilities do not sum to 1.
-Yes. The events are distinct and the probabilities sum to 1.
-Yes. The events are indistinct and the probabilities sum to less than 1.
b) Compute the expected age ? of a super shopper. (Round your answer to two decimal places.)
? = yr
c) Compute the standard deviation ? for ages of super shoppers. (Round your answer to two decimal places.)
? = yr
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