The number of defective products in each of 40 samples taken from a production run are shown here. In each sample, 200 units were examined and classified as either good or defective, depending on whether dimensional tolerances had been met. Use an appropriate 3-sigma control chart in commenting on the state of control of the process.

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Sample Number of Sample Number of Number Defectives Numbe Defectives 12 21 10 23 4 12 25 26 27 15 13 10 12 29 30 31 32 16 12 10 12 13 12 12 12 15 16 17 18 19 20 34 35 36 37 38 39 40