probability distribution, Basic Statistics

In a mathematics examination the average grade was 82 and the standard deviation was 5. all students with grade from 88 to 94 received grade of B. if the grade are approximately normally distributed and 8 students received a B grade , how many students took the examination?
Posted Date: 9/14/2012 3:03:41 PM | Location : United States

please send the answer please
Posted by cecile abarquez | Posted Date: 1/24/2013 5:45:37 AM

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