High School

Joe is 6 years old and obtained a mental age of 9 years on an old IQ test. What is his IQ according to the old formula for IQ?

Answer :

Final answer:

The student's IQ is calculated using the old IQ formula where the mental age is divided by the chronological age, and the result is multiplied by 100. For a 6-year-old with a mental age of 9, the IQ is 150.

Explanation:

The original, or 'old', formula for calculating IQ (Intelligence Quotient) is the ratio of mental age to chronological age, multiplied by 100. In Joe's case, his mental age is 9 and his chronological age (real age) is 6. So, using the old IQ formula we get:

IQ = (Mental Age / Chronological Age) * 100

So, for Joe:

IQ = (9 / 6) * 100 = 150

So, based on the old formula, Joe's IQ would be 150.

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