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December 22, 2014

Homework Help: statistics

Posted by kabita on Thursday, February 16, 2012 at 6:49am.

2. The grades on a statistics midterm exam were normally distributed with a
mean of 72 and a standard deviation of 8.
a. What is the proportion of students received a B grade.
b. What is the proportion of students that failed the exam?
c. What is the grade of the 92nd percentile?

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