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Lesson Summary. In summary, IQ stands for intelligence quotient, which is your cognitive abilities, relative to what others can do of different ages. The concept of IQ was invented in the year 1904 by Alfred Binet. The equation used to calculate a person's IQ score is Mental Age / Chronological Age x 100.
Actual IQ tests, like the Stanford-Binet Intelligence Scales or the Wechsler Adult Intelligence Scale (WAIS-IV), contain several hundred questions and take, in the case of the WAIS-IV, between 60 and 90 minutes to complete. Then thereâs the way that IQ scores work. IQ points are arranged along a bell curve so that 100 is at the top of the bulge with most of the scores surrounding it. 100 should always be the average score of an IQ test within its intended audience.