Determine two-sigma control limits using the above data?

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 
  Number of complaints:   4     11     14     8     9     6     5     13     14     7     6     4       2     11


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" wherever required. Round up any negative control limit value to zero.)

UCL:_____
LCL:_____
 
b. Is the process in control?
Yes or No