Answer :

Final answer:

The IQ of a child who is 10 years-old and has a mental age of 12 is 120; calculated by dividing the mental age by the chronological age and then multiplying this result by 100.

Explanation:

The IQ (Intelligence Quotient) of a person, including a child, is usually calculated by taking their mental age and dividing it by their chronological age, then multiplying this result by 100. In order to find a child's IQ, if a child who is 10 years old had a mental age of 12, the calculation would be as follows:

  1. Mental Age (12 years) / Chronological Age (10 years) = 1.2
  2. 1.2 * 100 = 120

So, the child's IQ would be 120. This places the child in the higher intelligence range, as the average IQ score for most of the population is between 85 and 115.

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