A person is said to be mentally retarded when IQ is
Normal IQ → 90-109;
Borderline IQ → 70-89;
Mild mental retardation IQ → 50-69;
Moderate mental retardation IQ → 35-49;
Severe MR IQ → 20-34;
Profound MR IQ → 0-19.
< 100
<90
<80
<70