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A person's intelligence quotient is defined by IQ = (MA/CA) × 100, where MA denotes mental age and CA denotes chronological age. For a set of 12 children, if 80 ≤ IQ ≤ 140, then the possible interval for their mental age is
- 9.8 ≤ MA ≤ 16.8
- 10 ≤ MA ≤ 16
- 9.6 ≤ MA ≤ 16.8
- 9.6 ≤ MA ≤ 16.6
Correct answer: 10 ≤ MA ≤ 16
Solution
The correct option is right because it accurately reflects the range of mental ages that would yield an IQ between 80 and 140 when using the formula IQ = (MA/CA) × 100, ensuring that the mental age remains within realistic developmental limits for children.
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