Software upgrade times (in minutes) are being evaluated. Samples of five observations each have been taken, and the results are as listed. Factors for three-sigma control limits for x and R charts a. Using factors from above table, determine upper and lower control limits for mean and range charts. (Round your intermediate calculations and final answers to 2 decimal places. Leave no cells blank - be certain to enter " 0 " wherever required.) b. Decide if the process is in control. The process is in control. The process is not in control