The mean score of a college entrance test is 500; the standarddeviation is 75. 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

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