Probability Curve

Question

Scores on the SAT form a normal distribution with an average of 500 and a standard deviation of 100. Based on this information, what percent of scores fall above an SAT score of 520?

Answer 1

the z score for 520 is (520 - 500)/100 = 0.2

 

P(z) = 0.57926, meaning that 57.926% of the test population were at or below this number.

 

Therefore the percentage ABOVE this must be 100 - the above %, which is 42.074%