# Reply To: What is standard deviation?

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February 19, 2017 at 9:02 am
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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.

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.