Intelligence And Aptitude — Psychology STD 12 Humanities — Question

Intelligence or IQ scores are distributed in a population in such a way that most people tend to fall in the middle range of the distribution. This can be graphically shown in the following bell shaped curve.

Children with very low IQ scores, i.e. below 70, face enormous difficulty in learning simple skills and are termed “Mentally Challened” or “Mentally Retarded”.
Categories of Mental Retardation:

1. Mild retardation (I.Q. 55-69).
2. Moderate retardation (LQ.40-54).
   1. Severe retardation (LQ.25-39).
3. Profound retardation (I.Q. below 25).

On the other end of the curve are Intellectually Gifted individuals who show higher performance because of their outstanding potentialities.
Categories:

1. High average (LQ. 110-119).
2. Superior (LQ. 120-130).
3. Very Superior (I.Q. 130 and above).