Reply To: What is standard deviation?

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KzooRichie
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Good explanations so far…. my take cause I like stats 
 
you can have averages.  Suppose your gun should is shooting an average of 880 FPS.  That  sounds pretty good. You can have that average if you have lots of shots at 1300 FPS and lots at 400 FPS. Standard deviation is a way to express how far shots deviant from the mean.  The lower the SD the closer every shot (or whatever) is to the mean.  Lower numbers mean most shots are about the same speed.

SD involves lots of finding means and squaring, but in a nutshell SD means consistency.  Low numbers = high consistency.