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Help Problem 7: The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days.

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Problem 7: The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. a. Find the probability of a pregnancy lasting more than 295 days. Include a sketch of the graph and shade the area to be determined. b. How many days will be the first quartile of the due date? c. How many days will correspond to the 80% of the distribution

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