Suppose that distribution of grades has average of 78 with, Ask an Expert

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a.) The grades of class are A 10%, B 20%, C 40%, D 20% and F 10%. A.) if we assume that the grades are normally distributed, how many standard deviations on either side of the mean will consist C grades?

b.) Suppose that distribution of grades has average of 78 with standard deviation of 11. Find the appropriate cutoff points for the grades A and F.

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