A math professor notices that scores from a recent exam are normally distributed with a mean of 60 and a standard deviation of 5. Answer the following questions using integer values.
Suppose the professor decides to grade on a curve. If the professor wants 0.15% of the students to get an A, what is the minimum score for an A?

Question

A math professor notices that scores from a recent exam are normally distributed with a mean of 60 and a standard deviation of 5. Answer the following questions using integer values. 
Suppose the professor decides to grade on a curve. If the professor wants 0.15% of the students to get an A, what is the minimum score for an A?

phi · Answer

0.15 %  (that is very few, are you sure it's not 15% ??)
but assuming 0.15% that is 0.0015
you want the area under the curve to be 1-0.0015 = 0.9985
how many std dev's do you have to be above the mean to get 0.9985 of the area?
any idea ?