Page "Intelligence quotient" Paragraph 37
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Wechsler introduced a different procedure for his test that is now used by almost all IQ tests.
When an IQ test is constructed, a standardization sample representative of the general population takes the test.
The median result is defined to be equivalent to 100 IQ points.
In almost all modern tests, a standard deviation of the results is defined to be equivalent to 15 IQ points.
When a subject takes an IQ test, the result is ranked compared to the results of the standardization sample and the subject is given an IQ score equal to those with the same test result in the standardization sample.
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