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An IQ score of 115 means performance one standard deviation above the mean, while a score of 85 means performance one standard deviation below the mean, and so on. [5] This "deviation IQ" method is now used for standard scoring of all IQ tests in large part because they allow a consistent definition of IQ for both children and adults.
The IQ figures are based on 3 different studies for 17 nations, two studies for 30 nations, and one study for 34 nations. There were actual tests for IQ in the case of 81 countries out of the 185 countries studied. For 104 nations there were no IQ studies at all and IQ was estimated based on the average IQ of surrounding nations. [2]
5.85 40–44 81 670 74 067 155 737 4.48 45–49 63 827 54 980 118 807 3.42 50–54 44 870 38 070 82 940 2.39 55–59 30 975 25 485 56 460 1.62 60–64 25 473 27 357 52 830 1.52 65-85+ 57 470 60 641 118 111 3.40 65-69 19 250 20 557 39 807 1.14 70-74 12 343 13 403 25 746 0.74 75-79 11 580 11 333 22 913 0.66 80-84 5 408 6 599 12 007 0.35 85+ 8 889
The WAIS-IV is the known current publication of the test for adults. The reason for this test was to score the individual and compare it to others of the same age group rather than to score by chronological age and mental age. The fixed average is 100 and the normal range is between 85 and 115.
The 1981 article "Average IQ values in various European countries" by Vinko Buj is the only international IQ study that over a short time period has compared IQs using the same IQ test. Rindermann (2007) states that it is of dubious quality with scant information regarding how it was done. [3] [4]
Borderline intellectual functioning, previously called borderline mental retardation (in the ICD-8), [1] is a categorization of intelligence wherein a person has below average cognitive ability (generally an IQ of 70–85), [2] but the deficit is not as severe as intellectual disability (below 70). It is sometimes called below average IQ (BAIQ).
its missing the lower half of the average range. Looking at the source, “normal or average” should be 90-110. Not 110 Terman's Stanford–Binet original (1916) classification IQ Range ("ratio IQ") IQ Classification Above 140 "Near" genius or genius 120–140 Very superior intelligence 110–120 Superior intelligence
The Bell Curve: Intelligence and Class Structure in American Life is a 1994 book by the psychologist Richard J. Herrnstein and the political scientist Charles Murray in which the authors argue that human intelligence is substantially influenced by both inherited and environmental factors and that it is a better predictor of many personal outcomes, including financial income, job performance ...