![]() ![]() About 2.5 percent of the population scores above 130, and 2.5 percent below 70. By this definition, approximately two-thirds of the population scores are between IQ 85 and IQ 115. When current IQ tests were developed, the median raw score of the norming sample is defined as IQ 100 and scores each standard deviation (SD) up or down are defined as 15 IQ points greater or less, although this was not always so historically. The resulting fraction is multiplied by 100 to obtain the IQ score. Historically, IQ is a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months. The abbreviation "IQ" was coined by the psychologist William Stern for the German term Intelligenzquotient, his term for a scoring method for intelligence tests at University of Breslau he advocated in a 1912 book. An intelligence quotient (IQ) is a total score derived from several standardized tests designed to assess human intelligence.
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