Control charts for means and ranges. Processing times for new accounts at a bank are shown in the following table. Five samples of four observations each have been taken. Use the sample data in conjunction with Table 10.3 to construct upper and lower control limits for both a mean chart and a range chart. Do the results suggest that the process is in control? Sample 1 10.2 9.9 9.8 10.1 40.0 Sample 2 10.3 9.8 9.9 10.4 Sample 3 9.7 9.9 9.9 10.1 39.6 Sample 4 9.9 10.3 10.1 Sample 5 9.8 10.2 10.3 9.7 40.0 10.5 Totals 40.4 40.8 a. Determine the mean and range of each sample. b. Compute the average mean and average range: c. Obtain factors A2, D., and D, from Table 10.3 for n = 4: A2 = .73, D. = 2.28, D= 0. d. Compute upper and lower limits: e. Verify that points are within limits