Question

5. What percentage of the scores are within one standard deviation of the mean ?
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Hint: Divide the number of items from #4 above by the total number of test scores, and then multiply by 100 to convert the decimal into percent.
A. 65%
B. 70%
C. 75%
D. 80%

Answer 1

B. 70%

Reason: By the empirical rule about a normal distribution, about 68% of scores lie within one standard deviation of the mean, which is rounded to 70% (choice B).