Process time at a workstation is monitored using sample mean and range control charts. Six samples of n=15 observations have been obtained and the sample means and ranges computed (in minutes): 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.) b. Is the process in control? No Yes