Assuming that data exhibit a normal distribution, control limits set at $\pm$ 3 standard deviations from the mean capture how much common variation?
A) 50.00%
B) 80.00%
C) 95.44%
D) 99.74%
E) 99.99%

Question

Quizplus · Accepted Answer

Control limits set at 3 standard deviations from the mean capture 99.74% of the common variation in data that follow a normal distribution. This is also known as the 3-sigma rule or the empirical rule. Therefore, the best choice is D.

Assuming That Data Exhibit a Normal Distribution, Control Limits Set ±\pm±

Assuming That Data Exhibit a Normal Distribution, Control Limits Set $\pm$