Multiple choice six-sigma green-belt

The percentage of data values falling within one standard deviation of the center is

  1. 62.35%

  2. 68.26%

  3. 78.38%

  4. 95.46%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a normal distribution, approximately 68.26% of the data falls within one standard deviation (plus or minus) of the mean. 95.46% falls within two standard deviations, and 99.73% falls within three standard deviations. This is known as the Empirical Rule.

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