How is IQ a deternined?

Answer 1

A test, or multiple of tests, given by a trained psychologist or teaching professional to determine the "average" of knowledge or skill based on your culture to others. I feel it's important to realize that IQ is not a static number but fluid and while based on the general population, your IQ, if taken as an average of smaller subgroups, "changes" in that you will be ranked lower or higher based on the comparisons.

There is something called the "Flynn effect" which states that about every generation, the average IQ raises by 10 points. It says our world is more complicated and IQs have risen over time.

It is difficult to assess the IQ of adults, unless they are low.

It is important to remember that IQ tests only a limited span of intelligence. It does not access kinetic IQ, which athletes are extremely high in. Or EQ (emotional quotient) which measures our ability to function in interpersonal situation. A person with Asberger syndrome has a very low EQ. On average, girls score higher than boys on EQ tests at every age until 25.