Mental retardation is defined as IQ less than-
High-Yield Explanation
Ans i.e., 'd' i.e., 70 Classification of mental retardationo A child with IQ < 70 is called as mentally retarded.Degree of MRIQMild51-70Moderate36-50Severe21-35Profound0-20o IQ level between 71-90 is designated as borderline intelligence.