Question

Computing IQ

Find out the mental age of a 12-year-old child with an IQ of 90.

Answer 1

Chronological Age (CA) = 12 years

IQ = 90

`IQ = \frac{MA}{CA} \times 100`

$$MA = \frac{IQ \times CA}{100}$$

$$MA = \frac{90 \times 12}{100}$$

$$MA = \frac{1080}{100}$$

MA = 10.8 years

Since the IQ (90) is less than 100, the mental age (10.8 years) is less than the chronological age (12 years); the child falls in the ‘Average’ IQ category (90–109).