The mean score on a test is 80, and the standard deviation is 20 points. What percentage of people scored 75 or less? (Round to the nearest whole number.)
A) 10
B) 40
C) 43
D) 60
E) None of the above

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The Answer of The mean score on a test is 80, and the standard deviation is 20 points. What percentage of people scored 75 or less? (Round to the nearest whole number.)
A) 10
B) 40
C) 43
D) 60
E) None of the above

The Mean Score on a Test Is 80, and the Standard