Soft-drink cans are filled by an automated filling machine and the standard deviation is

Chapter 5, Problem 5-62

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Soft-drink cans are filled by an automated filling machine and the standard deviation is 0.5 fluid ounce. Assume that the fill volumes of the cans are independent, normal random variables. (a) What is the standard deviation of the average fill volume of 100 cans? (b) If the mean fill volume is 12.1 ounces, what is the probability that the average fill volume of the 100 cans is below 12 fluid ounces? (c) What should the mean fill volume equal so that the probability that the average of 100 cans is below 12 fluid ounces is 0.005?(d) If the mean fill volume is 12.1 fluid ounces, what should the standard deviation of fill volume equal so that the probability that the average of 100 cans is below 12 fluid ounces is 0.005? (e) Determine the number of cans that need to be measured such that the probability that the average fill volume is less than 12 fluid ounces is 0.01.

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