A person is said to be mentally retarded when IQ is: (A) < 100, (B) <90, (C) <80, (D) <70
Answer is D. 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.