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Which formula correctly expresses William Stern's Intelligence Quotient?
AMental Age divided by Chronological Age, multiplied by 100
BChronological Age divided by Mental Age, multiplied by 100
CMental Age plus Chronological Age, divided by 2
DChronological Age minus Mental Age, multiplied by 10
Answer & Solution
Correct answer: A. Mental Age divided by Chronological Age, multiplied by 100
1. In 1912, William Stern, a German psychologist, devised the concept of Intelligence Quotient.
2. The chapter gives the formula explicitly.
3. IQ refers to mental age divided by chronological age, multiplied by 100.
4. The 100 multiplier is used to avoid the decimal point.
5. Hence IQ = (MA / CA) x 100.
_Source: NCERT Class 12 Psychology Ch 1 "Variations in Psychological Attributes", p. 10, Assessment of Intelligence_
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