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1 2 points Below are 4 samples with 7 observations each. Using the R-Chart, determine the upper control limit for the mean. (round to 2 decimal places in your answer) Sample 1 79.2 78.8 80.0 78.4 181.0 80.2 Sample 2 80.5 178.7 81.0 80.4 80.1 80.0 79.8 Sample 3 79.6 79.6 80.4 80.3 80.8 79.9 80.1 Sample 4 78.9 79.4 79.7 79.4 80.6 80.4 78.9 79.9 FACTORS FOR R CHARTS Number of Observations in Sample, n Factor for Chart, A2 Lower Control Limit, D3 Upper Control Limit, D4 2 3 4 1.88 1.02 0.73 0.58 0 0 0 0 0 5 6 0.48 0.42 7 8 0.08 0.14 3.27 2.57 2.28 2.11 2.00 1.92 1.86 1.82 1.78 1.74 1.72 1.69 9 10 0.18 0.22 0.26 11 12 13 0.28 0.31 14 15 0.37 0.34 0.31 0.29 0.27 0.25 0.24 0.22 0.21 0.20 0.19 0.19 0.18 0.33 0.35 0.36 0.38 16 1.67 1.65 1.64 1.62 1.61 17 18 19 0.39 0.40 0.41 1.60 1.59 20 Type your