Sophia's IQ score is 85.She performed as well or better than __________ percent of her agemates.
A) 16
B) 36
C) 50
D) 85

Question

Quizplus · Accepted Answer

An IQ score of 85 falls one standard deviation below the mean IQ score for the general population, which is set at 100. The distribution of IQ scores is assumed to be normal with a mean of 100 and a standard deviation of 15. Approximately 16% of the population scores one standard deviation below the mean or lower, hence Sophia performed as well or better than about 16% of her age mates.

Sophia's IQ Score Is 85