What percentage of the area of a normal curve is between +2 and -2 standard deviations?
A)0%
B)68.3%
C)95.5%
D)99.7%
E)100%

Question

Quizplus · Accepted Answer

According to the empirical rule, approximately 95.5% of the area under a normal curve falls between +2 and -2 standard deviations from the mean. Specifically, about 34.1% of the area is between the mean and +1 standard deviation and another 34.1% is between the mean and -1 standard deviation. Adding these two together gives 68.2%. Doubling this percentage gives approximately 95.5%.

What Percentage of the Area of a Normal Curve Is