Given a normal distribution of intelligence test scores (mean=100, s.d.=15), what is the probability that someone will score between 100 and 115?
A) cannot be determined
B) .15
C) .68
D) .34

Question

Quizplus · Accepted Answer

In a normal distribution, the area between the mean and one standard deviation above the mean (in this case, between 100 and 115) accounts for 34% of the data, hence the probability is 0.34 or 34%.

Given a Normal Distribution of Intelligence Test Scores (Mean=100, S