Question: A process sampled 20 times with a sample of size 8 resulted in x-bar = 28.5 and R-bar = 1.6. Compute the upper and lower

A process sampled 20 times with a sample of size 8 resulted in x-bar = 28.5 and R-bar = 1.6. Compute the upper and lower control limits for the and R charts for this process.

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