Calculate the Intelligence Quotient of an individual who is 12 years old and has the mental age of a 12-years old.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 100
Intelligence Quotient (IQ) is mental age divided by chronological age, multiplied by 100:
IQ = (MA ÷ CA) × 100
MA = 12 years, CA = 12 years
IQ = (12 ÷ 12) × 100 = 1 × 100 = 100
When the mental age equals the chronological age, the IQ is always 100: the person performs at the average level of her/his age group.
NCERT (2025-26): “Assessment of Intelligence … In 1912, William Stern, a German psychologist, devised the concept of Intelligence Quotient (IQ). IQ refers to mental age divided by chronological age, and multiplied by 100.…” “The number 100 is used as a multiplier to avoid the decimal point. When the MA equals the CA, the IQ equals 100.…” |