In developmental psychology, if a seven-year-old child has an IQ of 100, what is the child's mental age?

• A. 14 years
• B. 100 years
• C. 7 years
• D. 10 years

Answer: (C)

Verified step by step guidance

1. Understand the concept of IQ (Intelligence Quotient) in developmental psychology, which is calculated using the formula: \(\text{IQ} = \left( \frac{\text{Mental Age}}{\text{Chronological Age}} \right) \times 100\).
2. Identify the given values: the child's chronological age is 7 years, and the IQ is 100.
3. Rearrange the IQ formula to solve for Mental Age: \(\text{Mental Age} = \frac{\text{IQ} \times \text{Chronological Age}}{100}\).
4. Substitute the known values into the formula: \(\text{Mental Age} = \frac{100 \times 7}{100}\).
5. Simplify the expression to find the mental age, which will give you the child's mental age in years.