SOLUTION: A professor has found that the grades on a Statistics Exam are normally distributed with mean 72 and a standard deviation of 12. If only the best 15 % of the grades in the class w

Question 1033456: A professor has found that the grades on a Statistics Exam are normally distributed with mean 72 and
a standard deviation of 12. If only the best 15 % of the grades in the class will get an A, what grade
must a student get in order to get an A?
I got as far as 15%=15/100=.15
1-.15=.85
and I got stuck. plz help me
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
We need to find such that

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