An intelligence quotient, or IQ, is a score obtained from one of several standardized tests intended for intelligence evaluation.
An intelligence quotient, or IQ, is a score obtained from one of several standardized tests intended for intelligence evaluation. In 1912, the German psychologist William Stern conceived the term "IQ" from the German Intelligenz-Quotient as a proposed method for scoring child intelligence tests such as those developed by Alfred Binet and Théodore Simon in the early 20th century. For his revision of the Binet-Simon test, the first version of the Stanford-Binet Intelligence Scales, Lewis Terman embraced this type of scoring, expressing a score as a quotient of "mental era" and "chronological age."
| Intelligence Interval | Cognitive Classification |
|---|---|
| 40 - 54 | Severely challenged (Less than 1% of test takers) |
| 55 - 69 | Challenged (2.3% of test takers) |
| 70 - 84 | Below average |
| 85 - 114 | Average (68% of test takers) |
| 115 - 129 | Above average |
| 130 - 144 | Gifted (2.3% of test takers) |
| 145 - 159 | Genius (Less than 1% of test takers) |
| 160 - 175 | Extraordinary genius |
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