A professor gives a test to her calculus students. The scores are approximately normally distributed with mean 75 points and standard deviation 9 points. The professor decides to give As to...

A professor gives a test to her calculus students. The scores are approximately normally distributed with mean 75 points and standard deviation 9 points. The professor decides to give As to approximately 10% of the students but not less than 10%. Find the cutoff score for an A.