Approximately what percentage of IQ scores fall between 70 and 130?
A)50
B)65
C)95
D)99

Question

Quizplus · Accepted Answer

IQ scores are standardized so that the average score is 100 with a standard deviation of 15. Using this information, we can find that approximately 95% of IQ scores fall within two standard deviations of the mean. This means that IQ scores between 70 and 130 cover the middle 95% of the distribution. Therefore, choice C is the best option, as it correctly states that about 95% of scores fall between 70 and 130.

Approximately What Percentage of IQ Scores Fall Between 70 and 130