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A) If the length of human pregnancies from conception to birth is approximately normally distributed with mean 268 days and standard deviation 12 days, find

A) If the length of human pregnancies from conception to birth is approximately normally distributed with mean 268 days and standard deviation 12 days, find the value of the first quartile.

B) If the length of human pregnancies from conception to birth is approximately normally distributed with mean 268 days and standard deviation 12 days, what proportion last between 278 and 288 days?

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