IQ grade
Those with IQ below 70 belong to mental retardation; If the IQ is between 70 and 79, it belongs to critical intelligence; If the IQ is between 80 and 89, it belongs to lower-middle intelligence; Those with IQ of 90- 109 belong to medium IQ; IQ between110-119 belongs to upper-middle intelligence; If the IQ is between 120 and 139, it belongs to excellent intelligence; Those whose IQ is above 140 belong to genius intelligence.
Influencing factors of IQ
Intelligence is controlled by heredity and cannot be artificially changed. But due to congenital factors, people's intellectual development will be different. The main factors affecting IQ are heredity, breast milk, diet, weight, environment and drugs.
Definition of intelligence
Intelligence is the ability of people to know objective things and use knowledge to solve practical problems. Intelligence is manifested in people's observation, memory, imagination, creativity, analytical judgment, thinking ability, adaptability, reasoning ability and so on. At present, intelligence consists of three abilities: short-term memory ability, reasoning ability and language ability.
Calculation method of IQ
Iq is expressed by the formula: IQ=MA (psychological age) /CA (physiological age) × 100, which is called ratio IQ.