<prompt> Formula to calculate intelligence quotient IQ:Chronological ageMental age 100Mental age - Chronological Age 100Mental ageChronological age 100Mental age Chronological Age 100  <response>: C i.e. Mental ageChronological Age 100Ref: Parks Textbook of Preventive and Social Medicine, 24th editionExplanation:IQ Mental Age Chronological Age 100 Distribution of intelligence in normal populationClassification of TypesI.Q. Inteligence Quotient1. Near genius or genius140 and above2. Very superior130-1393. Superior120-1294. Above average110-1195. Normal or average90-1096. Below average80-897. Dull or borderline70-798. Feebleminded, moron50-699. Imbecile25-4910. Idiot0-24 