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How to figure standard deviation.

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by timmyatnop, Feb 4, 2013.

  1. Feb 4, 2013 #1
    timmyatnop

    timmyatnop Well-Known Member

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    Hi everone iam trying to figure my standard deviation. My best 8 shot string. Had an es of 16 fps. How do you guys figure sd? Thanks
     
  2. Feb 4, 2013 #2
    boomtube

    boomtube Well-Known Member

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    Find the average of what ever you wish to measue.
    Figure the difference for each sample from the average, then square that difference,
    Total the squares of all your samples.
    Find the square root of the total of the squares.
     
  3. Feb 4, 2013 #3
    Greyfox

    Greyfox Well-Known Member

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    Google, "Standard Deviation Calculator", there are several listed. Just enter your numbers and it will give you the answer.
     
  4. Feb 4, 2013 #4
    cowboy

    cowboy Well-Known Member

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    Never knew this was available - thanks
    Never seizes to amaze me about what google can come up with.
     
  5. Feb 5, 2013 #5
    timmyatnop

    timmyatnop Well-Known Member

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    Tried it. Your right. It worked great.