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July 30, 2015

Homework Help: statistics

Posted by StudentD on Wednesday, August 15, 2012 at 12:34pm.

In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5. Approximately what percentage of students have scores between 70 and 90?

A. 68%

B. 80%

C. 95%

D. 99%

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