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Mental Subnormality    

I.Q. =     mental age                 X 100
                chronological age
  1. Normal IQ is > 90
  2. Mental retardation is IQ < 70
  3. Idiocy/profound MR: IQ = 0 – 20
  4. Imbecility/severe MR: IQ = 21 – 35
  5. Moron/moderate MR: IQ = 36 – 50
  6. Mild MR: IQ = 51 – 70




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