Approximately what percentage of IQ scores falls between 70 and 130?
A)50 per cent
B)67 per cent
C)75 per cent
D)95 per cent

Question

Quizplus · Accepted Answer

IQ scores are scaled so that the average score is 100 and the standard deviation is 15. Using this information, we can calculate that approximately 95% of IQ scores fall between 70 and 130. This is because one standard deviation below and above the average (100) is 70 and 130, respectively, and 95% of scores fall within two standard deviations of the average.

Approximately What Percentage of IQ Scores Falls Between 70 and 130