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The postmaster of a small western town receives a certain number of complaints each day about mail delivery. DAY 13 7 10 11 14 Number of complaints 10 16 12 13 6 2 10 Click here for the Excel Data File a. Determine three-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. Leave no cells blank - be certain to enter "O" wherever required. Round up any negative control limit value to zero.) UCL LCL b. is the process in control? YoS ONO