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(Steps Shown) The duration of human pregnancies from conception to birth is approximately normally distributed, with a mean of 265 days and a standard deviation

Question: The duration of human pregnancies from conception to birth is approximately normally distributed, with a mean of 265 days and a standard deviation of 15 days.

What is the probability that the duration of a human pregnancy is less than or equal to 228 days?
What is the probability that the duration of a human pregnancy exceeds 300 days?
What is the probability that duration of a human pregnancy lasts from 238 clays to 299 days?
Twenty percent of human pregnancies last more than what amount of time?

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(Steps Shown) The duration of human pregnancies from conception to birth is approximately normally distributed, with a mean of 265 days and a standard deviation

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