The postmaster of a small western town receives a certain number of complaints each day about mail delivery Day                    1       2      3     4    5     6    7     8      9    10    11  12   13   14 Complaints        4     12    16    8    9    6     5     12    15     7    6    4     2     9 a.  Determine two-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 "0" whenever required.  Round up any negative control limit value to zero.) UCL   LCl   b.  Is this process in control? No or Yes

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