(2a). In the manufacture of disk drives, samples of size 20 were seen to have an

Question

(2a). In the manufacture of disk drives, samples of size 20 were seen to have an overall average of 320 grams, and the sample ranges had an average of 1.3 grams. Find the upper control limit for future sample averages. (Give answer with at least two significant digits to the right of the decimal point; note: only the UPPER control limit) (b). A not so capable process makes parts for internal consumption. The probability of any part being defective is 1/1000. The cost of inspection is $40 per hour. On average, 500 units are inspected in an hour. What is the average cost of catching a defect?

Explanation / Answer

Answer: 1

Part A:

Part b:

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