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Question: the length of a single pregnancy is normally distributed with...

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The length of a single pregnancy is normally distributed with a mean of 268 days and standard deviation 7 days. a. b. c. d. What is the probability that a single pregnancy lasts between 255 and 280 days? What is the probability that a single pregnancy lasts longer than 275 days? 15% of single pregnancy babies have been born at or before what day? What is the probability that exactly 1 of a sample of 4 women with a single pregnancy has their pregnancy last longer than 275 days?

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