Posted by **melissa** on Monday, November 29, 2010 at 12:35pm.

In one history class, 34 students took an exam. The mean of the exam was 52 with

a standard deviation of 13. If the instructor is going to assume data are

normally distributed and assign grades on a curve, then she will assign an A to

the top 10% of the class, B's to the next 15%, and C's students in the next 60%

of the students. What is the minimum score for A? What is the grade range for a

B? What is the grade range for a C?

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