the absolute measure of how far an individual differs from the mean on an individually administered IQ test. This is the approach now most commonly used in standard IQ tests. A reported deviation IQ is a standard score on an IQ test that has a mean of 100 and a standard deviation specific to that of the test administered, usually 15 or 16 for intelligence tests. The test scores represent a deviation from the mean score rather than a quotient, as was typical in the early days of IQ testing.