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William Stern's formula for the intelligence quotient was mental age/chronological age à - 100. What is the IQ of a 12-year-old with a mental age of 9?

a. 125

b. 135

c. 75

d. 85

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  1. 5 March, 01:34
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    William Stern's formula for the intelligence quotient was mental age/chronological age à - 100. What is the IQ of a 12-year-old with a mental age of 9?

    c. 75
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