Math Question

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TPB12335

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When you figure out your deviation from average velocity, do you end up with negative numbers or are they all positive. Eg. 5 shots, 2651, 2678, 2642, 2618, 2681 = AVG of 2654

So taking the first shot, @ 2651, this would be a deviation of 3. Now in the case of the last shot @2681 is a deviation of 27, one is faster and one is slower than the average. Are either of these values a negative to reflect if they are faster or slower than the average?

This is all to figure out standard deviation.

Hope I am making sense, this is my first attempt at getting into this much detail with my reloading.

Thanks
 
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When you subtract x average by x1. It is supposed to be surrounded by absolute bars, which means whatever result you get, will be positive.

Some sites use normal brackets instead of the absolute brackets which is wrong.
 
Typically in statistics you measure variance which is the square of the deviation. The square root of the variance gives the standard deviation. Taking the square root of a squared value is the exact same operation as taking the absolute value or only positive values. You want standard deviation to tell you the spread around a value so negatives are unnecessary. You just need to know that the values tend to deviate from the mean by say 0.3 units in either direction
 
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