By the current "deviation IQ" definition of IQ test standard scores, about two-thirds of all test-takers obtain scores from 85 to 115, and about 5 percent of the population scores above 125. Deviation IQs are now used for standard scoring of all IQ tests in large part because they allow a consistent definition of IQ for both children and adults. An IQ score of 115 means performance one standard deviation above the median, a score of 85 performance, one standard deviation below the median, and so on. In this method, an IQ score of 100 means that the test-taker's performance on the test is at the median level of performance in the sample of test-takers of about the same age as was used to norm the test. The current scoring method for all IQ tests is the "deviation IQ".
IQ classification is the practice by IQ test publishers of labeling IQ score ranges with category names such as "superior" or "average". Score distribution chart for sample of 905 children tested on 1916 Stanford–Binet Test
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