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[GMAT math practice question]
The test scores of students at a school have a distribution that is symmetric about the mean m. 68 percent of the test scores lie within one standard deviation d of the mean. If the average score of students at the school is 65 and the standard deviation is 5 points, what percent of the students at the school score more than 70 points?
A. 10%
B. 12%
C. 14%
D. 16%
E. 18%
The test scores of students at a school have a distribution that is symmetric about the mean m. 68 percent of the test scores lie within one standard deviation d of the mean. If the average score of students at the school is 65 and the standard deviation is 5 points, what percent of the students at the school score more than 70 points?
A. 10%
B. 12%
C. 14%
D. 16%
E. 18%
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