Intelligence Quotient, or IQ, is a score used by standardized tests as a means of describing one’s intelligence level. The formula for IQ is (mental age / chronological age) x 100. An average score is 100; about 95% of IQ scores fall between 70 and 130.
Example: After taking an IQ test, a precocious little girl learns that her score is an above-average 120.
Grinnell, R. (2008). Intelligence Quotient. Psych Central. Retrieved on August 4, 2015, from http://psychcentral.com/encyclopedia/2008/intelligence-quotient/