Question: A process has been run under controlled conditions. During this period, twenty random sample sets of six were taken, resulting in Ex-bar=83.25 cm and R=40.12

A process has been run under controlled conditions. During this period, twenty random sample sets of six were taken, resulting in Ex-bar=83.25 cm and R=40.12 cm. The upper control limit for the range, using three standard deviations, is 1) 5.125 2) 3.199 3) 0 4) None of the above

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