Question: A process, when in control, produces a normally distributed output with a mean x-bar of 100 and a mean range of 16. When using a

A process, when in control, produces a normally distributed output with a mean x-bar of 100 and a mean range of 16. When using a sample size of 20 and 3 standard deviation control limits, which of the following is the lower control limit of the R chart?

- 6.63

- 2.28

- 12.80

- 16.00

- 6.80

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