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

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11. 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. Choose two pregnancies independently and at random. a. What is the expected difference in the lengths of the two pregnancies? b. What is the standard deviation of the difference in the lengths of the two pregnancies? c. Find the probability that the difference in the lengths of the two pregnancies is greater than 25 days

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