Given that on one section of the SAT the mean is 500 and the standard deviation is 100, what is the approximate probability of a student scoring 400 or higher on the test?
A)0.84
B)0.50
C)0.16
D)0.34

Question

Quizplus · Accepted Answer

A score of 400 is one standard deviation below the mean (500 - 100 = 400). Using the standard normal distribution, approximately 68% of the data falls within one standard deviation of the mean, so about 16% is below one standard deviation. Therefore, the probability of scoring 400 or higher is 1 - 0.16 = 0.84.

Given That on One Section of the SAT the Mean