SOLUTION: The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What is the probability that a pregnancy lasts at least 275 d

Question 1131526: The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What is the probability that a pregnancy lasts at least 275 days?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What is the probability that a pregnancy lasts at least 275 days?
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z(275) = (275-268)/15 = 7/15
P(x >= 275) = P(z >= 7/15) = normalcdf(7/15,100) = 0.3204
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Cheers,
Stan H.
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