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25 December, 19:24

Suppose heights of 20-year-old men are approximately normally distributed with a mean of 71 in. and a population standard deviation of 5 in. a random sample of twenty 20-year-old men is selected and measured. find the probability that the sample mean x lies between 68 and 74 inches.

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  1. 25 December, 21:53
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    That probability is about 99.3%.
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