If Greg is 10 years old, and if he answers the same number of intelligence test questions correctly as the average 9-year-old, his computed IQ would be:
A) 111
B) 100
C) 90
D) An answer cannot be determined because not enough information is given to compute his IQ.

Question

Quizplus · Accepted Answer

IQ has been defined as mental age divided by chronological age multiplied by 100. In this case, 9 divided by 10 multiplied by 100 is equal to 90.

If Greg Is 10 Years Old, and If He Answers