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March 29, 2015

Homework Help: algebra 2

Posted by Lea on Monday, April 8, 2013 at 5:09pm.

Students at a high school all took the same English test. The scores are approximately normally distributed with a mean of 77 and a standard deviation of 9. If 2500 students took the test, approximately how many scored above 86 or below 68%?

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