Reply To: What is standard deviation?

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jking
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The same question came to my mind just a couple of days ago. I’ve always looked at ES which was easier to calculate. I shot a 10 shot string through my chronograph and played with the results as calculated by the chronograph. It was actually the first time in 5 years that I actually did that. I think everyone’s answer is correct but if you want to calculate it on paper I believe this is how. I could be wrong and I don’t mind being enlightened..

Shot #    Vel.   Diff
1             887    
2             891     4
3             886     5
4             886     0
5             893     7
6             885     8
7             881     4
8             881     0
9             890     9
10           888     2
Sum of differences is 39 divided by 9 shots is 4,3 Averaged Deviation. (I think)
Extreme spread is 10