A. Assuming a normal distribution of waiting times, find the proportion of customers that will have to wait more than 50 minutes. B. To reduce the waiting time of customers, the service manager hires some additional mechanics, which reduces the average waiting time to 35 minutes. What proportion of the customers will still have to wait more than 50 minutes if the variability in service times is the same as before?
A. Assuming a normal distribution of waiting times, find the proportion of customers that will have to wait more than 50 minutes. B. To reduce the waiting time of customers, the service manager hires some additional mechanics, which reduces the average waiting time to 35 minutes. What proportion of the customers will still have to wait more than 50 minutes if the variability in service times is the same as before?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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answer letter a and b
Transcribed Image Text:A. Assuming a normal distribution of waiting times, find the proportion of customers
that will have to wait more than 50 minutes.
B. To reduce the waiting time of customers, the service manager hires some
additional mechanics, which reduces the average waiting time to 35 minutes. What
proportion of the customers will still have to wait more than 50 minutes if the
variability in service times is the same as before?
Transcribed Image Text:Problem 2
A major automobile company is interested in reducing the time that customers have to
wait while having their car serviced with one of the dealers. They select four customers
randomly each day and find the total time that each of those customers has to wait
(in minutes) while having his or her car serviced. Next, from these four observations,
the sample average and range are found. This process is repeated for 25 days.
The summary data for these observations are
25
25
ΣΧ = 1000
i=1
i-1
R₁ = 250
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