Question: 5. A process is set so that it coats roofing with a layer of material that weighs an average of 6 pounds per square yard.

5. A process is set so that it coats roofing with a layer of material that weighs an average of 6 pounds per square yard. The standard deviation of the process, under controlled conditions measured on a square yard of roofing, is 0.124 pound. Determine the upper and lower control limits for X so that a = 0.05 when samples of size n = 6 are taken.

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