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Question: 12 the lengths of pregnancies are normally distributed with a...

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12. The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If 25 randomly selected women are put on a special diet just before they become pregnant, find the probability that their lengths of pregnancy have a mean that is less than 260 days, assuming that the diet has no effect. (rounded to the four decimal places)

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