How to calculate a person's IQ?

IQ is the abbreviation of IQ, which means IQ. It is an index to measure the level of individual intelligence development. It was first put forward by German psychologist L.W.Stern, and American psychologist Tuimon quoted the IQ in Stanford-Binet.Alfred Scale and improved it. IQ is the quotient obtained by dividing the intellectual age (mental age) by the actual age and multiplying it by 100, that is, the ratio IQ. Its calculation formula is:

Calculation method: IQ = Ma (intellectual age) /CA (actual age) × 100.

It is based on the assumption that the intellectual age increases with the actual age. In fact, intelligence does not increase linearly with age. /kloc-After 0/6 years old, intelligence basically stops developing. Obviously, IQ has great limitations. Wexler, a famous American medical psychologist, used the calculation method of wandering IQ when compiling the Children's Intelligence Scale. It is calculated according to the mean () and standard deviation SD in statistics, that is, the score of an individual with standard deviation deviates from the average score of his age group, so it is not affected by the age of the candidate. This calculation method not only overcomes that psychological age can only be compared horizontally between the same age groups, but also overcomes that ratio IQ can only be compared between different age groups. Nowadays, IQ calculation methods that deviate from IQ are commonly used.

Psychologists regard intelligence test as a tool to measure people's intelligence level, and use IQ to express intelligence. There were also many intelligence tests in ancient times. For example, during the Northern Qi Dynasty in China, Liu Zhou used the test of "Let the left hand draw a square and the right hand draw a circle, so that it can all work at once" to measure people's intelligence. None of these tests have specific indicators. The IQ scoring method widely used now originated from Binet.Alfred. Alfred's concept of knowledge age.

Intellectual age, also known as mental age, refers to a certain age level of intelligence and is a measure of a person's intelligence. The original Simon Binet.Alfred. Alfred's intelligence test uses the age scale to express the test score. Here is the age scale, that is, in the scale, there are six questions in each age group, and each question represents the intellectual age of two months. Adding up the intelligence age of subscales of all ages correctly is the intelligence age of children.

Later, it was found that the intellectual age was 10, which had different meanings for children aged 8, 10 and 15. Therefore, in 19 16, the revised Si-Bi scale adopts the concept of IQ. IQ is the quotient of intellectual age and actual age mentioned above. When you divide the two ages, you will get more decimals. In order to conform to people's habits, psychologists integer this quotient, which is multiplied by 100:

Iq =MA (intellectual age) /CA (actual age) × 100

If intellectual age represents the level of psychological development and is an absolute quantity, then IQ represents the speed of psychological development and is a relative quantity. Obviously IQ is more scientific than intellectual age.

As can be seen from the calculation formula of IQ above, it is very likely that IQ is greater than 100. But is 1 17 a "genius" score?

Someone has made statistics on the proportion of IQ scores in the crowd:

Only 1% of people in the population have an IQ above 140; IQ points range from 120 to 13911%; 18% belongs to1/kloc-0 ~119; 46% belong to 90 points ~ 109 points; 15% belongs to 80 ~ 89 points; 6% belongs to 70 ~ 79 points; In addition, 3% of people have an IQ below 70, which means they are mentally retarded.