The standard range of normal people’s IQ is 110 to 90.

IQ is a 200-point scale. Those with a score of 90 to 110 are within the normal range of intelligence, those with a score of 120 to 140 are considered smart, and those with a score of 140 or above are called geniuses.

It was proposed by German psychologist Stern in 1912. IQ is the abbreviation of intelligence quotient, which is expressed in English as IQ.

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.

The higher the IQ, the smarter the person.

Ciological age refers to the actual age of a child after birth. Mental age or psychological age is the age measured based on intelligence measurements.

IQ (English: IQ), that is, Intelligence Quotient, is an index that compares an individual’s intelligence test scores with those of subjects of the same age. It is a standard for measuring the level of an individual’s intelligence. The concept of IQ was proposed by Professor Terman, a psychologist at Stanford University in the United States.

At the beginning of the 20th century, French psychologist Alfred Binet (1857-1911) and his students compiled the world's first set of intelligence scales. Based on this set of intelligence scales, the average person's The average IQ is set at 100, and according to this set of tests, the IQ of normal people is mostly between 85 and 115. Intelligence is controlled by genetic genes and cannot be changed by humans.

Due to various innate factors, people’s intellectual development will be different. A series of standardized tests measure a person's level of intellectual development at their age, and must be used in conjunction with Spiritual Quotient (SQ).

It is people’s ability to understand objective things and use knowledge to solve practical problems. Intelligence reflects many aspects, such as observation, memory, imagination, creativity, analytical judgment ability, thinking ability, adaptability, reasoning ability, etc., including cultural quotient (CQ). Intelligence is currently thought to consist of three abilities: short-term memory, reasoning, and language.

Later, Professor Terman introduced this scale to the United States and revised it to the Stanford-Binet Intelligence Scale, and used the ratio of mental age to physiological age as an index to evaluate children's intelligence level. This ratio was It is called intelligence quotient, expressed by the formula: IQ=MA (mental age)/CA (physiological age) × 100. People call this kind of IQ ratio IQ.