Question

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

Answer 1

140

Step-by-step 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