A paper mill uses a control chart to monitor the imperfections in finished rolls of paper. Production output is inspected for twenty days, and the resulting data are shown below. Set up a control chart for nonconformities per roll of paper. Remove any out of control points, and re-calculate the control limits and center line. Provide the final control chart center line and limits below. Show your equations

Day Number of Rolls Produced Total Number of Imperfections Day Number of Rolls Produced Total Number of Imperfections
1 18 12 11 18 18
2 18 14 12 18 14
3 24 20 13 19 8
4 22 18 14 20 10
5 22 15 15 20 14
6 22 12 16 20 13
7 20 11 17 24 16
8 20 13 18 24 18
9 20 12 19 22 20
10 20 10 20 21 17

 

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