IQ tests are constructed so that scores are normally distributed, with the average score at any age being 100, with a standard deviation of

Question

Quizplus · Accepted Answer

The standard deviation for IQ tests is typically around 15 points, so the correct answer is (C). The normal distribution of IQ scores means that the majority of people will score within one standard deviation of 100 (i.e. between 85 and 115). It is not -5 or -15, as IQ scores cannot be negative. It is not 30, as this would make the distribution too wide and too many people would fall outside of the average range.

IQ Tests Are Constructed So That Scores Are Normally Distributed