The production manager of a soap manufacturing company wants to monitor the weights of the bars produced on the line. Twenty bars are taken during a stable period of the process. The weights of the bars are shown in the following table.

Compute control limits for individual observations and moving-range charts. Determine whether the process is in statistical control.
Estimate the process mean and standard deviation for the in-control process.
What process capability is this operating?

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Bar Weight Bar Weight 74 11 99 82 12 75 97 13 77 86 14 82 71 15 93 6. 68 16 70 83 17 87 8. 90 18 76 6. 88 19 84 10 64 20 94 2. 3. 4.