The probability of any event falling within one standard deviation of the mean (plus or minus) is .

Name: The probability of any event falling within one standard deviation of the mean (plus or minus) is .
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This is a well-known property of the normal distribution, also known as the "68-95-99.7 rule". Within one standard deviation of the mean, we expect to find approximately 68% of all observations.

The Probability of Any Event Falling Within One Standard Deviation