Question: A process, when in control, produces a normally distributed output with a mean X-bar of 200 and a mean range of R-bar of 20. When

A process, when in control, produces a normally distributed output with a mean X-bar of 200 and a mean range of R-bar of 20. When using samples of size 20 and 3 Standard Deviation control limits, then which of the following is the upper control limit of the R chart?

Group of answer choices

20

22

26

30.5

31.8

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