Assuming a normal distribution of 1000 cases, how many cases will be farther away from the mean than + 3 standard deviations?
A) At least 500
B) About 3
C) 327
D) It is impossible to estimate.

Question

Quizplus · Accepted Answer

In a normal distribution, approximately 99.7% of the data falls within three standard deviations of the mean. This means that about 0.3% of the data lies outside of this range. Since 0.3% of 1000 is 3, about 3 cases will be farther away from the mean than +3 standard deviations.

Assuming a Normal Distribution of 1000 Cases, How Many Cases