High School

Mrs. Ross, a teacher, wanted to measure the IQ of the newly admitted students in her class. Using William Stern's method for calculating intelligence, she found that Sarah, a ten-year-old girl, had the mental age of a 14-year-old. What is Sarah's intelligence score?

Answer :

Answer:

140

Explanation:

William Stern, the German psychologist, devised the fundamental definition of intelligence quotient or IQ in 1912. He defined IQ as a ratio of an estimated mental age and actual age by multiplying it with 100. The equation can be reached thus:


100×(mental age/actual age).


In case of Sara, her actual age is 10 and her mental age is 14. Therefore, her IQ is equal to 100 x 14/10 = 140


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