
SUMMARY
Standard Deviations show the distance from the mean or the square root of the variance. The below bell curve should be quite familiar to most. When a data point is at the 2 std dev level, it's hitting top 13.6%; when at 3 std dev; then it's at the upper tier of 2.1% such that it's above 97.9% from the mean. In other words, such extreme departures away from the mean is not sustainable.

Here is Bitcoin (BTC) where the Bollinger Bands measure to 2 std dev levels. As price is well outside the lower blue line; it has clearly exceeded the 2 std dev and approaching 3 std dev. This level of departure away from the mean is not sustainable. Being at 2.1% means that mean reversion is likely.
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