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**Mal H** · August 13, 2002, 01:43 AM

You couldn't tell from the pic?

The chronograph is that calculator looking device sitting on the bench. The sky screens (in front of the rifle in the picture) must always be close to where the bullet is going to travel. So it is possible to shoot them if you're not careful.

Let the chronograph do all the math for you. It'll do it about 50,000 times faster and more accurately.

To answer your question though, the standard deviation is the square root of the summation of the squares of the difference of each sample in a set to the average of the set divided by the number of samples. See why you should leave the calc to the chrono?

August 13, 2002, 01:43 AM	#4
Mal H Staff Join Date: March 20, 1999 Location: Somewhere in the woods of Northern Virginia Posts: 16,949	You couldn't tell from the pic? The chronograph is that calculator looking device sitting on the bench. The sky screens (in front of the rifle in the picture) must always be close to where the bullet is going to travel. So it is possible to shoot them if you're not careful. Let the chronograph do all the math for you. It'll do it about 50,000 times faster and more accurately. To answer your question though, the standard deviation is the square root of the summation of the squares of the difference of each sample in a set to the average of the set divided by the number of samples. See why you should leave the calc to the chrono?