As it is she is at least a grade below where she belongs by mental age.
The result, however, showed a mental age of 11½ years, or an I Q of 143.
Mental age in the first test was 8-6 and in the second test 11.
Their mental age ranges from three to seven years inclusive.
If he goes only as far as normal 8-year-old children ordinarily go, we say that his “mental age” is 8 years.
Thus, an error of 10 months in the mental age of a 5-year-old means an error of almost 15 per cent in the intelligence quotient.
The intelligence quotient (often designated as I Q) is the ratio of mental age to chronological age.
The mental age of a subject is meaningless if considered apart from chronological age.
He is only in the third grade, and is therefore about three grades below his mental age.
No child varied in the second test more than half a year from the mental age first secured.