A bank branch uses an improved process for serving customers during 12-to-1 p.m. The waiting time, in minutes (defined as the time the customer enters the line to when he/she reaches the teller window), of a sample of 15 customers during this hour is recorded over a period of one week as: 9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 5.64 4.08 6.17 9.91 5.47

a. Compute mean, median, Q1, and Q3.
b. Compute variance, standard deviation, range, interquartile range, CV, and minimum and maximum Z scores. Are there any outliers? Explain.
c. Are the data skewed? If so how?
d. As the customer walks into the branch office during lunch hour, he asks the branch manager how long he can expect to wait. The branch replies "Almost certainly less than five minutes." On the basis of results of (a) through (c), evaluate the accuracy of this statement. had waiting time greater than 5 minutes, so the customer is likely to experience more than 5 minutes waiting time. The manager overstated the bank's service record while replying the customer)