Question: To set R-chart upper and lower control limits, one must know the process central line , which is the elect one: a total number of

To set R-chart upper and lower control limits, one must know the process central line , which is the elect one: a total number of defects in the random samples b. average percent defects in the random samples c. average of the sample ranges d. size of population . standard deviation of average fraction defective
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