What is the probability that a randomly selected customer spends more than $45 at this store? B.Find the dollar amount such that 75% of all customers spend no more than this amount. C. Find the dollar amount such that 80% of all customers spend at least this amount. D. Find two dollar amounts, equidistant from the mean, such that 90% of all customer purchases are between these values.

What is the probability that a randomly selected customer spends more than $45 at this store? B.Find the dollar amount such that 75% of all customers spend no more than this amount. C. Find the dollar amount such that 80% of all customers spend at least this amount. D. Find two dollar amounts, equidistant from the mean, such that 90% of all customer purchases are between these values.

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

Suppose it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $75 and standard deviation $20.

A. What is the probability that a randomly selected customer spends more than $45 at this store?

B.Find the dollar amount such that 75% of all customers spend no more than this amount.

C. Find the dollar amount such that 80% of all customers spend at least this amount.

D. Find two dollar amounts, equidistant from the mean, such that 90% of all customer purchases are between these values.

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