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The lengths of pregnancies in a small rural village are normally distributed with a mean of...

The lengths of pregnancies in a small rural village are normally distributed with a mean of 264 days and a standard deviation of 15 days. In what range would you expect to find the middle 68% of most pregnancies? Between and . If you were to draw samples of size 47 from this population, in what range would you expect to find the middle 68% of most averages for the lengths of pregnancies in the sample? Between and .

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