Help Save & Exit Process time at a workstation is monitored using sample mean and range control charts. Six samples of n = 11 observations have been obtained and the sample means and ranges computed (in minutes): Subm Range .48 Sample 1 2 3 4 5 6 Mean 3.23 3.14 3.22 3.06 3.27 3.18 .46 .41 .47 .44 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 No