Question: A manager wishes to build a 3-sigma range chart for a process. The sample size is six, the mean of sample means is 25.5, and

A manager wishes to build a 3-sigma range chart for a process. The sample size is six, the mean of sample means is 25.5, and the average range is 4.2. What are the UCL and LCL, respectively, for this range chart?

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