In a recently administered IQ test, the scores were distributed normally, with mean 100 and standard deviation 15. What proportion of the test takers scored between 70 and 130?
A. About 68%;
B. About 84%
C. About 95%
D. About 99.5%
According to 68-95-99.7 rule, 68% of data lies between 1 standard deviation from mean, 95% between two standard deviation from mean & about 99.7% lies between 3 standard deviation from mean.
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In a recently administered IQ test, the scores were distributed normally, with mean 100 and standard...
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