The mean score of a college entrance test is 500; the standarddeviation is 75. T
ID: 2914968 • Letter: T
Question
The mean score of a college entrance test is 500; the standarddeviation is 75. The scores are normally distributed. What percent of the students scored below 320? Which is thecorrect answer? A. About 50.82% B. About 34.13% C. About 7.86% D. About 0.82% The mean score of a college entrance test is 500; the standarddeviation is 75. The scores are normally distributed. What percent of the students scored below 320? Which is thecorrect answer? A. About 50.82% B. About 34.13% C. About 7.86% D. About 0.82%Explanation / Answer
z = (320-500)/75 = -2.4 look this up in a Z table and get 0.0082, so the answer is D