Computer upgrades have a nominal time of 80 minutes. Samples of five observations each have been taken, and the results are as 5 listed SAMPLE 3 79. 2 79. 6 78.9 80.5 79.7 78.8 78.7 79.6 79. 4 79. 6 80.6 se. e 81.0 80.4 79.7 80. 4 80.5 78.4 80.4 80.3 79. 4 80. 8 80.0 81.0 80.1 80.8 80.6 78.8 81.1 Factors for three-sigma control limits for x and R charts FACTORS FOR R CHARTS Number of Lower Upper Factor for Observations Control Control in Subgroup I Chart. AZ . . Limit.,. Limit, D3 D4 12 1.88 3.27 ::1.02 2.57 0: 73 2. 28 0.58. 2. 11 0. 48 2.00 0.42 3. 08 1. 92 0.37 0.14 1 .86 9 0.34 0. 18 1. 82 10 0.31 0.22 1. 78 0.29 0.26 1.74 12 0.27 3. 28 1. 72 13 0.25 0.31 1. 69 14 0.24 0.33 1. 67 15 0.22 0.35 1. 65 16 0.21 0.36 1. 64 17 0.20 0.38 1. 62 18 0. 19 0.39 1. 61 19 0. 19 0.40 1.60 0. 18 0.41 1.59 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.) Mean Chart Range Chart UCL LCL b. Decide if the process is in control