1. 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 below. 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?

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