Question: A process in being evaluated for stability using X bar R chart. The sample size is 4 and sampling frequency is 2 hours. No of

A process in being evaluated for stability using X bar R chart. The sample size is 4 and sampling frequency is 2 hours. No of subgroups taken for calculation of control limits are 15. The Grand Average is 100 and Average Range is 7. What are the control limits for X bar and R chart ?

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