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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

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 1.8 grams. Find the upper control limit for future sample averages. (Give answer with at least two decimal places; note: only the UPPER control limit).

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