If IQ scores are normally distributed,having a mean of 100 and a standard deviation of 15,approximately what percentage of people have IQ scores between 85 and 115?
A) 34
B) 50
C) 68
D) 95

Question

Quizplus · Accepted Answer

According to the Empirical Rule for a normal distribution, approximately 68% of the observations fall within one standard deviation of the mean. Since the mean is 100 and the standard deviation is 15, one standard deviation below the mean is 85 and one standard deviation above the mean is 115. Therefore, approximately 68% of people have IQ scores between 85 and 115.

If IQ Scores Are Normally Distributed,having a Mean of 100