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show all work 28. The length of human pregnancies is normally distributed with mean u = 266 days, and standard deviation o = 16 days.

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28. The length of human pregnancies is normally distributed with mean u = 266 days, and standard deviation o = 16 days. If an obstetrician takes a random sample of 20 pregnancies, find the probability that the average length of all 20 pregnancies is less than 260 days. (3 pts)

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