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The average time to service a customer complaint has been 5 days and the standard deviation has been 0.70 day. Management would like to specify

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The average time to service a customer complaint has been 5 days and the standard deviation has been 0.70 day. Management would like to specify the controllimits for an X-chart with a sample size of 20 and 3-sigma limits. The UCL for the chart would be

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