Math

In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule:

The top 10% receive A's.
The next 20% receive B's.
The middle 40% receive C's.
The next 20% received D's.
The bottom 10% receive F's.

What is the least amount of points that a student must score, on the final exam, in order to earn a C? (Round your answer to two decimal places.)

the answer is 72?

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  1. http://davidmlane.com/hyperstat/z_table.html

    area = .4
    mean = 72
    SD = 9
    .4 are between 71.5 and 72.5
    so 71.5

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