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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

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. A study enrolls a random sample of 18 pregnant women.

What is the probability that a random sample of 18 pregnant women has a sample mean pregnancy length that isless than or equal to 270 days?

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