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☐ A
A bank branch located in a commercial district of a city has the business objective of developing an improved
process for serving customers during the noon-to-1:00 p.m. lunch period. The waiting time, in minutes, is
defined as the time the customer enters the line to when he or she reaches the teller window. Data collected
from a sample of 15 customers is as follows
4.21 5.55 3.02 5.13 4.77 2.34 3.54 3.20
4.50 6.10 0.38 5.12 6.46 6.19 3.79
Find the sample mean.
A. 4.29
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B. 3.79
C. 5.10
D. 4.55
