![]() When we plot a sample of the population's IQ scores on an IQ against percentage chart, it is observed that the population distribution on the IQ scale forms a symmetrical bell-shaped curve. However, the normal or average IQ score will always remain 100. ![]() It is true that modern intelligence tests now apply statistical methods to produce a score reflecting one's performance compared to the average performance of his peers. Hence, the normal or average IQ score is 100, which means that the mental and chronological ages coincide. We already know that IQ = Mental Age/Chronological Age X 100 IQ above 140 is generally considered as that of a genius. IQ below 70 is taken as that of mentally challenged person. Since the average IQ is said to be 100, hence anything above 100 is considered as above average and below 100 as below average. However all tests and scales use 100 as the IQ of a person of average intelligence. Hence two people have an IQ of 120 on different scales might not necessarily have the same intelligence level. There are different types of IQ tests with each having their own scale. ![]() What is a good IQ score? What is a high IQ score? What is a low IQ score? These are common questions, particularly after someone finds out their score from an IQ test. IQ Articles > What is IQ? How Do You Interpret The IQ Test Scores?
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