If a 12-year-old child has an IQ of 75, what would be the child's Mental Age ?
A9
B8
C10
D12
Answer:
A. 9
Read Explanation:
Formula for Intelligence Quotient (IQ)
- The concept of IQ was introduced by William Stern and popularized by Lewis Terman.
- The mathematical formula used to calculate IQ is: IQ = (Mental Age / Chronological Age) × 100.
Step-by-Step Calculation
- Given data:
- IQ = 75
- Chronological Age = 12 years
- Substitution: 75 = (Mental Age / 12) × 100
- Rearranging the equation: Mental Age = (75 × 12) / 100
- Calculation: 900 / 100 = 9
Key Pedagogical Context
- Mental Age (MA) is a measure of a person's level of mental development compared to their chronological age.
- Chronological Age (CA) refers to the actual age of the individual from birth.
- In this scenario, the child's mental age is 9 years, indicating that their cognitive development is lower than that of an average child of the same chronological age.