Question

cholastic Aptitude Test (SAT) scores are normally distributed with a mean of 500 points and a standard deviation of 100 points. what is the probablity of a student's scoring a 700 or above?

Answer 1

A little more than three percent. This is a look-up from a z-score. Manual calculation is possible, but way too hard.

Answer 2

z = ( 700 - 500 ) / 100 = 2
Look up your z-score table with z= 2 for P !