IQ stands for intelligence quotient, which is a psychometric test (psychological measurement) for measuring a person's intelligence when compared to other people of the same age. The most popular IQ test was developed by a French psychologist Alfred Binet in early 19th century. The IQ score, or the quotient, reflects one's placement on a range in which the average score is 100 and the standard deviation is 15. For instance, a test taker who scores 130 on an IQ test is two standard deviations above the mean, or approximately the 95th percentile. The mental ability or intelligence was measured in the form of verbal, math, and logic deduction questions. The score for a test taker with normal intelligence level is 100. According to the ...

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