According to the question,
Chronological age = CA = 12 years
IQ for age group of 12 is 80 ≤ IQ ≤ 140.
We get that,
80 ≤ IQ ≤ 140
Substituting
\( IQ= \dfrac{MA}{CA}\times 100\)
= \( 80 ≤\dfrac{MA}{CA}\times 100≤ 140\)
= \( 80 ≤\dfrac{MA}{12}\times 100≤ 140\)
\( 80 ≤\dfrac{12}{100}≤ \dfrac{MA}{12}\times 100≤ 140\times \dfrac{12}{100}\)
9.6 ≤ MA ≤ 16.8
Range of mental age of the group of 12 years old children is 9.6 ≤ MA ≤ 16.8
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