sample size = 6

Problems 1. The following information correspond to the weights of a piece of plastic (in grams) obtained from a production process. Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Mean 69.75 74.75 70.00 65.25 83.00 78.25 75.50 81.75 77.00 82.50 85.50 80.75 72.00 68.75 69.25 71.00 78.00 76.75 74.00 71.25 Range 32 14 17 13 22 27 22 13 27 25 33 24 28 18 32 22 25 9 6 16 Determine if the process is under control and Why? Round to two decimal places