Which Psychologist improved on Binets intelligence testing and suggested the use of an intelligence quotient IQ which is the child's mental age divided by their chronological age?

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March 2001 Which Psychologist improved on Binets intelligence testing and suggested the use of an intelligence quotient IQ which is the child's mental age divided by their chronological age?
	William Stern
	Max Werthheimer
	David Wechsler
	Theodore Reik