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Score distribution chart for sample of 905 children tested on 1916 Stanford–Binet Test. IQ classification is the practice of categorizing human intelligence, as measured by intelligence quotient (IQ) tests, into categories such as "superior" and "average". [1] [2] [3] [4]
An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was 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.
IQ Range ("deviation IQ") IQ Classification 145–160 Very gifted or highly advanced 130–144 Gifted or very advanced 120–129 Superior 110–119 High average 90–109 Average 80–89 Low average 70–79 Borderline impaired or delayed 55–69 Mildly impaired or delayed 40–54 Moderately impaired or delayed
Description: Current IQ tests typically have standard scores such that the mean score is 100 with each standard deviation from the mean counting for 15 IQ points. [1] The plot shows, assuming that such scores have a normal distribution, the percentage of people getting a score versus the score itself, from 55 to 145 IQ, that is over a span of six standard deviations.
Sex differences in human intelligence have long been a topic of debate among researchers and scholars. It is now recognized that there are no significant sex differences in average IQ, [1] [2] though particular subtypes of intelligence vary somewhat between sexes.
Results showed that the average firstborn had an IQ of 103, compared to 100 for second children and 99 for third children. The New York Times reports: "The new findings, from a landmark study ...