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

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. Call the length of a randomly chosen pregnancy . Reference: 4.52 4.52b What is ? Give your answer to 3 decimal places. Fill in the blank: _______ .