SOLUTION: The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If 64 women are randomly selected, find the probability that they h
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Question 1073762: The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If 64 women are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268 days. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If 64 women are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268 days.
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z(266) = (266-268)/[15/sqrt(64)] = -2/(15/8) = -1.0667
z(268) = 0
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P(266<= x <= 268) = P(-1<= z <=0) = normalcdf(-1.0667,0) = 0.3569
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Cheers,
Stan H.
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