A paper mill uses a control chart to monitor the imperfection in finished rolls of paper. Production output is inspected for 20 days, and the resulting data are shown in Table 6E.10. Use these data to set up a control chart for nonconformities per roll of paper. Does the process appear to be in statistical control? What center line and control limits would you recommend for controlling current production?

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Total Total Total Number Total Number Number Number Number Number Rolls Rolls Imperfections Imperfections 12 14 20 18 15 12 Day Produced Day Produced 18 18 18 18 24 12 18 13 10 20 20 20 24 14 15 16 20 20 20 20 18 19 20 15 20 12