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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 standard deviation

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.

If 20 pregnancies are randomly selected, what is the probability thatat least8last between 250 and 282 daysandat least8either end before 250 days or last longer than 282 days?

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