Intelligence quotient (IQ) is the score resulting from dividing a person’s chronological age by his or her mental age and multiplying that number by 100. Correct answer: A
The IQ express the relative intelligence of a person. Example: if a 30-year-old man had a mental age of 12 (that is, performed on the test at the level of an average 30-year-old), he was assigned an IQ of 12/30 × 100, or 40.The test used to determine the IQ is the Stanford-Binet test.