For a normal distribution of 1000 cases, how many cases will be within ± 1 standard deviations of the mean?
A) No more than 500
B) about 3
C) about 680
D) it's impossible to estimate because all normal curves are different

Question

Quizplus · Accepted Answer

The empirical rule states that approximately 68% of the cases fall within one standard deviation of the mean for a normally distributed data set. Therefore, in a normal distribution of 1000 cases, approximately 680 cases will be within ± 1 standard deviation of the mean.

For a Normal Distribution of 1000 Cases, How Many Cases