Question

IQ of a person is given by the formula IQ =MA/CA X100,

Where MA is mental age and CA is chronological age. If 80 ≤ IQ ≤ 140 for a group of 12 years old children, find the range of their mental age.

Answer 1

It is given that for a group of 12 years old children,
80 ≤ IQ ≤ 140 …………………………………. (i)
For a group of 12 years old children, CA = 12 years

IQ=MA/12 X100

Putting this value of IQ in (i), we obtain

Thus, the range of mental age of the group of 12 years old children is 9.6≤MA≤16.8