IQ is calculated by -: (A) Mental age/chronological age, (B) Mental age - chronological age, (C) Chronological age/mental age, (D) Chronological age - mental age
Answer is A. Ans. is 'a' i.e., Mental age/Chronological age The Intelligence Quotient (I.Q.) is calculated according to the formula:The WHO classification of mental retardation is based on the concept of IQ and includes the following categories:CategoryIQMild50-70Moderate35-49Severe20-34Profound<20A child with IQ <70 is called mentally retarded.