Answer :

Final answer:

A 4-year-old child with the mental age of 5 has a ratio IQ of 125.

Explanation:

A 4-year-old child with the mental age of 5 has a ratio IQ of 125. The mental age measures a child's intellectual development in comparison to the average intellectual development for a particular age group. Ratio IQ is calculated by dividing the mental age by the child's chronological age and multiplying by 100. Therefore, a child with a mental age of 5 and a chronological age of 4 would have a ratio IQ of 125.

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