Each hour, a 10 m 2 section of fabric is inspected for flaws. The numbers of flaws

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Each hour, a 10 m2section of fabric is inspected for flaws. The numbers of flaws observed for the last 20 hours are as follows:

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a. Compute the upper and lower 3σ limits for a c chart.

b. Is the process in control? If not, when is it first detected to be out of control?

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