Mental retardation VS IQ

Formula to calculate IQ

The German psychologist William Stern (1871-1938) introduced the idea of intelligence quotient, or IQ

IQ=Mental /chronological age×100

Lets discuss how IQ determined mental retardation

Mental retardation VS IQ

Mild MR- 50 to 70

Moderate MR- 35 to 50

Severe MR- 20 to 35

Profound MR- Less than 20

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