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1. Assume that the lengths of human pregnancies are normally distributed with a mean of 266...

1. Assume that the lengths of human pregnancies are normally distributed with a mean of 266 days and a standard deviation of 16 days.

A. Determine the probability that a randomly selected pregnancy lasts between 252 and 273 days.

B. If a random sample of 20 pregnancies is selected, determine the probability that the sample mean will fall between 252 and 273 days.

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