1. Find the upper and lower control limits for x – and R -charts for the thickness of a special kind of disc when the sample grand mean (based on 40 samples of five observations each) is 1.5 millimeters and the average range is 0.03 millimeters. 2. Suppose that the sample grand mean for the weight of a package of candies based on 35 samples of 12 candies each is 18 ounces with an average range of 0.8 ounces. Find the upper and lower control limits for the x – and R-charts.

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