If you were to draw samples of size 59 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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I'm having a tough time with the last part of this question.

The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days and a standard deviation of 16 days.


If you were to draw samples of size 59 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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