what number is 2 standard deviations below the mean of 3.9
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You haven't stated the standard deviation or provided any more information. If the standard deviation is s then, with 3.9 as the mean, 3.9-2s is 2 standard deviations below the mean.

For example, if s=0.4, then 3.9-2s=3.1. But if s=0.9, then 3.9-2s=2.1.

Maybe you meant what is the probability of a value being 2 standard deviations below the mean, that is, the Z-score is -2. The answer would be 0.02275 or about 2.3%. 

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