Answer :
Final answer:
The IQ of a 9 year old child with a mental age of 12 is approximately 133. This is calculated using the formula IQ = (Mental Age / Chronological Age) x 100. However, this method has its limitations and may not fully illustrate a child's intellectual capacity.
Explanation:
The concept of mental age is used in calculating IQ (Intelligence Quotient). IQ can be calculated using the formula: IQ = (Mental Age / Chronological Age) x 100. In this case, your child's mental age is 12 and their chronological age is 9.
So, to derive the IQ using the formula: IQ = (12/9) x 100 = 133.33. So, your 9-year-old child's IQ would approximately be 133 if their mental age is rated as 12.
Please note that this method of calculating IQ has its limitations and may not fully illustrate a child's intellectual capacity in all areas.
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