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23 February, 21:49

How many standard deviations from the mean is considered unusual? Why?

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  1. 23 February, 23:03
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    It depends on how the data are distributed.

    Step-by-step explanation:

    If the data follow a normal (Gaussian) distribution, which is the most common, then 2 deviations from the mean is considered unusual because less than 4.55% of the data are in this situation.
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