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April 18, 2014

Homework Help: statistics

Posted by abby on Tuesday, April 13, 2010 at 11:20am.

The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, if students are given 90 minutes to complete the exam, what percentage of students will not finish?

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