In a normal distribution of scores, _______ percent of all people score within one standard deviation of the mean, and _______ percent of all people score within two standard deviations of the mean.
A) 50; 75
B) 68; 95
C) 75; 95
D) 95; 99

Question

Quizplus · Accepted Answer

In a normal distribution of scores, approximately 68% of all people score within one standard deviation of the mean, and approximately 95% of all people score within two standard deviations of the mean. This is known as the 68-95-99.7 rule. Choice B is the only option that reflects these percentages.

In a Normal Distribution of Scores, _______ Percent of All