The formula to determine I.Q is given by:

A. J. B. Watson
B. Freud
C. Pavlov
D. Stern
Correct Answer: D. Stern

The formula for calculating Intelligence Quotient (I.Q.) as (Mental Age / Chronological Age) * 100 was proposed by William Stern. The other psychologists are known for different theories, not this specific I.Q. formula.

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