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October 25, 2014

October 25, 2014

Posted by **Anonymous** on Sunday, April 15, 2007 at 4:35pm.

With a mean of 300, you are looking for a sample using a Standard Error of the Mean (SE). (The SE functions the exact same way for a distribution of means as the SD does for a distribution of raw scores.)

SE = SD/(sq.rt.of N) = 50/6

Once you can determine how many SE above the mean the value of 320 is, use the "Area Under the Normal Distribution" table in the back of your statistics book to find the probability.

I hope this helps. Thanks for asking.

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