Mathematics, 26.10.2021 19:20 MyaaaMoney

Subgroups of four power units are selected once each hour from an assembly line, and the high-voltage output of each unit is measured. Suppose that the sum of the ranges of 30 such subgroups is 85.2. Calculate the centerline and control limits of an R chart, if (σ) sigma is 1.2 for this data.

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