If the scores for a test have a mean of 70 and a standard deviation of 12, find the percentage of scores that will fall below 50.
A) 4.75%
B) 45.54%
C) 42.07%
D) 35.54%

Question

Quizplus · Accepted Answer

The z-score for a score of 50 is (50 - 70) / 12 = -1.67. The percentage of scores that will fall below 50 is the area under the normal distribution curve to the left of z = -1.67, which is 4.75%.

If the Scores for a Test Have a Mean of 70