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September 21, 2014

Homework Help: Statistics 250

Posted by Alica on Thursday, March 18, 2010 at 4:45am.

Final averages are typically approximately normally distributed with a mean of 65 and a standard deviation of 8. Your professor says that the top 10% of the class will receive an A; the next 20%, a B; the next 41%, a C; the next 19%, a D; and the bottom 10%, an F. (Give your answers correct to one decimal place.)

(a) What average must you exceed to obtain an A?


(b) What average must you exceed to receive a grade of C or better?


(c) What average must you obtain to pass the course? (You'll need a D or better.)

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