A company claims that the time their customers spend waiting in line for service is normally distributed with a mean of 21.4 minutes and a standard deviation of 7.2 minutes. What proportion of customers receive service in less than 13 minutes?
A company claims that the time their customers spend waiting in line for service is normally distributed with a mean of 21.4 minutes and a standard deviation of 7.2 minutes. What proportion of customers receive service in less than 13 minutes?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Step 1- Writing given data
Given that
The company claims that the time their customers spend waiting in line for service normally distributed.
Mean () = 21.4 minutes
Standard deviation () = 7.2 minutes
We know that
Z =
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