Question: A manager wants to build 3-sigma control limits for a metal place process. The diameter of the plate is critical and should be 124 inch.

A manager wants to build 3-sigma control limits for a metal place process. The diameter of the plate is critical and should be 124 inch. He took 5 samples, each containing 4 metal plates from different shifts. If the ranges of samples (in inch) are 122, 120, 124, 116 and 128. Compute the upper control limit for this process. Round to zero decimal places.

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