IQ is a quantitative indicator of a person’s intelligence. It was proposed by German psychologist stern in 1912. IQ is the abbreviation of intelligence quotient. IQ is expressed in English IQ. IQ is the quotient of intellectual age divided by physiological age.
IQ is calculated as follows:
IQ=MA÷C.A × one hundred
IQ indicates a person’s intelligence. The higher the IQ, the smarter it is. Physiological age refers to the actual age of a child after birth. Intellectual age or psychological age is the age measured according to intelligence measurement.
Intelligence age can only express the absolute level of intelligence, not the intelligence of children of different physiological ages. For example, the physical age of children a is 5 and the intellectual age is 6, while the intellectual age of children B is 10 and the intellectual age is 11. The intellectual age of both children is 1 year older than their physical age, which makes it difficult to compare their intelligence. Using IQ can compare their intelligence level relatively. A children’s IQ 5 / 6 × 100 = 120, the IQ of Child B is equal to 11 / 10 × 100=110。 From the IQ of children a and B, we can think that the intelligence level of children a is higher than that of children B.
Generally, people classify the level of intelligence as follows:
Those with an IQ above 140 are called geniuses,
IQ 120-140 is the best,
100-120 is excellent,
90-100 are common talents,
80-90 times normal,
70-80 is critical normal,
60-70 are mild mental retardation,
50-60 is Yulu,
20-25 is Chi Lu,
Below 25 is an idiot.

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