The IQ of a normal adult is 90-110.

IQ is mainly determined by heredity, but human intelligence is certainly not static. It develops with age and changes due to education and training. 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).

Extended information:

Influencing factors:

1. Heredity

The discovery of genes related to IQ is different in different races Frequency distribution shows that people with a high average IQ have more IQ genes than people with a low average IQ. Generally speaking, if parents have high IQ, their children's IQ will not be low.

2. Diet

A monotonous diet can lead to a deficiency of certain trace elements, or a diet that is too small, or a serious lack of protein and other nutrients can lead to stunted IQ development. Excessive intake of multiple metal elements such as lead, copper, etc. can also affect IQ.

Baidu Encyclopedia-IQ