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However, we can healthilyâ¦ assume that had some equivalent of an IQ test existed in history, that great thinkers such as Socrates, da Vinci, Isaac Newton, and so forth would have score up there.   Marilyn vos Savant has a IQ of 230. She has the highest recognised IQ score.
The average will always be 100, but how high or low a score is depends on the Standard Deviation (SD) of the test. Most tests use a SD of 15 or 16, but some tests use 24 where a score of 148 would translate to 130 on a test that uses SD 15. There is also no highest IQ possible.Most tests have a maximum possible score you can get on them (For example, the most common professional test in the USA, WAIS, has a maximum possible score of 160 SD 15). However, in theory IQ has no limitation.n I.Q between 90 and 110 is considered average; over 120, superior. Roughly 68% of the population has an IQ between 85 and 115. The average range between 70 and 130, and represents about 95% of the population. A score below 70 may indicate mental retardation, and a score above 130 may indicate intellectual giftedness.