Question: 4. (25 marks) a. The data from 10 samples with six pieces in each sample in a rolling process showed that the parts had an

4. (25 marks) a. The data from 10 samples with

4. (25 marks) a. The data from 10 samples with six pieces in each sample in a rolling process showed that the parts had an average thickness of .025 cm, and an average range of .009 cm. Calculate the control limits for the mean and range charts

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