All of you probably must have been labeled as dumb, bright, smart, stupid, clever etc. at different times of your life. Isn't it? This is where IQ comes into play as human beings getting influenced by such comments are invariably drawn towards knowing how intelligent they are? Like a kind of school grade, they want to know where their intelligence level stands. For a more intrinsic depiction of their intelligence, they usually turn to their IQ (Intelligence Quotient).
IQ or Intelligence Quotient is simply an attempt to measure intelligence. We use the word "attempt" because intelligence can never be measured accurately. Hence, we have to remain satisfied with 'relative intelligence'.
IQ is a "measure of relative intelligence which is determined by a single or a set of standardized test." IQ is a score derived from one of the several different standardized tests that attempts to measure intelligence. In other words, IQ can be defined as an attempt to measure a person's mental agility. It is a number that measures the people's cognitive abilities (intelligence) in relation to their age group. An Intelligence Quotient indicates a person's mental abilities relative to other persons of approximately the same age.
The IQ is a number that ranges from 0 to 200+ and is a ratio that is derived by comparing mental age to chronological age. The intelligence quotient is defined as 100 times the Mental Age (MA) divided by the Chronological Age (CA).
Hence, IQ = Mental Age/Chronological Age X 100