IQ is a 200-point scale. Those with a score of 90 to 110 are within the normal intelligence range, those with a score of 120 to 140 are considered smart, and those with a score of 140 or above are called geniuses. The lower the score, the worse the intelligence. Those with scores below 70 are intelligent. IQ is a quantitative indicator that indicates the level of a person's intelligence. It was proposed by German psychologist Stern in 1912. IQ is the abbreviation of intelligence quotient, which is expressed in English as IQ. IQ is the quotient calculated by dividing mental age by biological age. The calculation formula of IQ is as follows: IQ=MA÷C.A×100. IQ indicates how smart a person is. The higher the IQ, the more intelligent you are. Biological age refers to a child's actual age after birth. Mental age or psychological age is the age measured based on intelligence measurements.
Mental age can only indicate the absolute level of intelligence, but cannot indicate the level of intelligence of children of different biological ages. For example: Child A's biological age is 5 years old and his mental age is 6 years old, while child B's age is 10 years old and his mental age is 11 years old. The mental age of both children is 1 year older than their biological age, which makes it difficult to compare them. The level of intelligence of two people. Using IQ can make a relative comparison of their intelligence levels. The IQ of child A is 5/6×100=120, and the IQ of child B is 11/10×100=110. From the IQ of children A and B, we can conclude that the intelligence level of child A is higher than that of child B.
Usually people classify the level of intelligence as follows: those with an IQ of 140 or above are called geniuses, those with an IQ of 120-140 are the best, 100, 110, and 120 are excellent, 90-100 are ordinary talents, and 80- 90 is subnormal, 70-80 is borderline normal, 60-70 is mild mental retardation, 50-60 is stupid, 20-25 is stupid, and below 25 is an idiot. The person with a score of 50 to 70 is considered stupid, the person with a score of 25 to 50 is a dementia, and the person with a score of 0 to 25 is an idiot. Intelligence has both a genetic basis and is influenced by the environment. If the parents have high intelligence, their children will often have high intelligence; if the parents have average intelligence, their children will have average intelligence; if the parents have deficient intelligence, their children may have incomplete intellectual development.
As for how many people in the world have IQs above 150, it’s hard to say. .
It is said that the average IQ of Americans is about 101; the average IQ of Japanese is about 102~103; the average IQ of Chinese is over 110; Jews are the nation with the highest IQ in the world, with an average IQ of 115, and an IQ of 130 or above is recognized internationally as a genius. An IQ of 150 is considered very high!