Baidu Encyclopedia:

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. A measure 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 are used to measure a person's intellectual development level at their age, which must be used in conjunction with Spiritual Quotient (SQ).