# Deviation I.Q.

The amount by which any INTELLIGENCE QUOTIENT score may vary from the mean and remain tantamount to the mean. Thus, 100 is the mean, or average, I.Q. score of test takers on the Stanford-Binet I.Q. test, but on any given test, so many otherwise average test takers obtain scores that vary in both directions from the mean that they may, for statistical and practical purposes, be considered average. The term deviation I.Q. is used to express this variability or standard deviation (s.d.) from the mean. In the case of the Stanford-Binet I.Q. test, the mean is 100 and the standard deviation is about 16, which means any score between 84 and 116 may be considered average. The deviation I.Q. would be expressed as: mean = 100, s.d. = 16.