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The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 266 days and standard deviation

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The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 266 days and standard deviation 16 days. Use the 68-95-99.7 rule to answer the questions. How short are the shortest 16% of all pregnancies? (Give your answer as an exact number.) less than days long

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