IQ scores are normally distributed, with a mean of 100 and a standard deviation of 15. Approximately what percentage of people have IQ scores that fall below 70?
A)2%
B)5%
C)34%
D)64%

Question

Quizplus · Accepted Answer

An IQ score of 70 is two standard deviations below the mean (100 - 2*15 = 70). In a normal distribution, approximately 2% of the population falls below two standard deviations from the mean.

IQ Scores Are Normally Distributed, with a Mean of 100