Question: Rolls of coiled wire are monitored using a c-chart. 20 rolls have been examined, and the number of defects per roll has been recorded in

Rolls of coiled wire are monitored using a c-chart. 20 rolls have been examined, and the number of defects per roll has been recorded in the following table.
Sample number of defectives Sample number of defectives Sample number of defectives Sample number of defectives
1 3 6 2 11 6 16 2
2 2 7 3 12 2 17 1
3 4 8 5 13 4 18 3
4 5 9 1 14 1 19 4
5 1 10 7 15 3 20 1
(1) Compute three standard deviation control limits (z=3)
(2) Is the process in control?

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