IQ scores are normally distributed with a mean of 100 and a standard deviation of 15.Based on properties of the mathematical normal curve,which one of the following statements is TRUE?
A)Approximately 90 percent of the scores fall between 85 and 115.
B)A score of 70 is equally as probable as is a score of 130.
C)There are more scores above 130 than below 85.
D)There are more scores above the mean than below the mean.

Question

Quizplus · Accepted Answer

A score of 70 and a score of 130 are both 2 standard deviations away from the mean (100), making them equally probable in a normal distribution.

IQ Scores Are Normally Distributed with a Mean of 100