Is 3 standard deviations above the means considered an outlier?

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Is 3 standard deviations above the means considered an outlier?

Yes.

Using the empirical rule, we know that:

• 68% of the values lie within one standard deviation of the mean
• 95% of the values lie within two standard deviations of the mean

Anything out side of two standard deviations is considered an outlier.