A textile company monitors it process by counting the number of defects in the bolts of cloth it produces. To establish 3-sigma control chart limits, a random sample of 10 bolts of cloth is selected and the number of defects recorded, as shown below. What is the average number of defects per booth of cloth?

Sample1-17/sample2-19/sample3-15/sample4-18/sample5-16/sample6-14/sample7-15/sample8-16/sample9-15/sample10-15.

The standard deviation of the number of defects per bolt of cloth is?

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