# Reply To: What is standard deviation?

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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