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24. A supplier sells synthetic fibers to a manufacturing company. A simple random sample of 81...

24. A supplier sells synthetic fibers to a manufacturing company. A simple random sample of 81 fibers is selected from a shipment. The average breaking strength of these is 29 lb, and the standard deviation is 9 lb. The number of fibers that must be sampled so that a 99%confidence interval specifies the mean to within ±1 lb is nearly ___________.

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