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The postmaster of a small western town receives a certain number of complaints each day about mail delivery. Click here for the Excel Data File

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The postmaster of a small western town receives a certain number of complaints each day about mail delivery. Click here for the Excel Data File a. Determine three-sigma control limits using the above data. (Do not round intermediate calculations. Round your final answers to 3 decimal places. Leave no cells blank - be certain to enter " 0 " wherever required. Round up any negative control limit value to zero.) b. Is the process in control? The process is in control. The process is not in control

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