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 during this hour are stored in Bank1:

a. Compute the mean and median.
b. Compute the variance, standard deviation, range, coefficient of variation, and Z scores. Are there any outliers? Explain.
c. Are the data skewed? If so, how?
d. As a customer walks into the branch office during the lunch hour, she asks the branch manager how long she can expect to wait. The branch manager replies, €œAlmost certainly less than five minutes.€ On the basis of the results of ( a) through ( c), evaluate the accuracy of this statement.

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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