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  3. the lengths of pregnancies are normally distributed with a mean...

Question: the lengths of pregnancies are normally distributed with a mean...

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Example 4.) The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. A sample of 4 women are all pregnant. What is the probability that the mean length of their pregnancies will be more than 285 days? normal cdf
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