The average time to service customer complaint

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Historically, the average time to service a customer complaint has been 4 days and the standard deviation has been 1.5 days. Management would like to specify the control limits for an Upper X overbar?-chart with a sample size of 10 and 2?-sigma limits.

The standard deviation of the sample? means, sigma Upper X overbar?, ?is:

nothing days. ?(Enter your response rounded to 4 decimal? places.)

The UCL for the chart? is:

nothing days. ?(Enter your response rounded to 2 decimal? places.)

The LCL for the chart? is:

nothing days. ?(Enter your response rounded to 2 decimal? places.)

Reference no: EM132287525

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