The ratio IQ of an examinee whose chronological age is 8 years, 6 months and whose score on the Stanford-Binet Intelligence Scale is equivalent to a mental age of 7 years, 8 months is
A) 90.
B) 91.
C) 110.
D) 111.

Question

Quizplus · Accepted Answer

The IQ (Intelligence Quotient) is calculated using the formula: IQ = (Mental Age / Chronological Age) * 100. Here, the mental age is 7 years, 8 months (or 7.67 years), and the chronological age is 8 years, 6 months (or 8.5 years). Thus, IQ = (7.67 / 8.5) * 100 ≈ 90.

The Ratio IQ of an Examinee Whose Chronological Age Is