Reply To: What is standard deviation?

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Doug
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Thanks you all for helping me to understand this. As an example I entered a 10 shot string into the J.C. Brown & Werner Wicha spreadsheet and got this:

1     960       Min.   955
2     958       Max   961
3     956       Avg   958
4     956       ES    6
5     961       SD    2.31
6     961       Avg ‘#  51.75
7     955
8     956
9     957
10   960

Using jking’s example above I came up with a total difference between shots of 20, divided by 9, and got a SD of 2.2.  It’s close but I’m unsure if it is the correct math formula or not.