Problem 10-3 (LO2) Process time at a workstation is monitored using sample mean and range control charts. Six samples of n= 10 observations have been obtained and the sample means and ranges computed (in minutes): Sample 1 2 3 4 5 6 Mean 3.06 3.15 3.11 3.13 3.06 3.09 Range 0.42 0.50 0.41 0.46 0.46 0.45 a. Using the factors in Table 10-3, determine the upper and lower limits for sample mean and range control charts. (Round the intermediate calculations to 2 decimal places. Round the final mean answers to 2 decimal places. Round the final range answers to 3 decimal places.) UCL LCL Mean Range b. Is the process in control? Yes