SOLUTION: The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. A baby is premature if it is born three weeks early. Wh
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Question 11681: The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. A baby is premature if it is born three weeks early. What percentage of babies are born prematurely? Answer by khwang(438) (Show Source):
You can put this solution on YOUR website! 3 weeks = 21 days.
z = -21/15 = -7/5.
From the table of normal distribution , the prob. is
0.08
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