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 somewhere between 70 and 130?
A) 34
B) 50
C) 68
D) 95

Question

Quizplus · Accepted Answer

In a normal distribution, approximately 95% of the data falls within two standard deviations of the mean. Since 70 and 130 are two standard deviations away from the mean of 100 (100-2*15=70 and 100+2*15=130), about 95% of people have IQ scores in this range.

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