Es and Sd

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scott/r
Posts: 887
Joined: Wed Aug 27, 2014 8:22 pm
Location: far north brisbane

Es and Sd

#1 Postby scott/r » Sun Jan 22, 2017 8:55 am

Hey guys, extreme spread I have a handle on. Pretty basic stuff. But sd I'm not up to par with. First off how do you calculate it? Is there a formula to work it out? And what is the main reason for these numbers?

Scott.

Steve N
Posts: 463
Joined: Tue May 14, 2013 8:16 pm
Location: Gippsland Victoria.

Re: Es and Sd

#2 Postby Steve N » Sun Jan 22, 2017 9:17 am

Scott you can get an SD calculator app for your phone or pad. A rough calculation can be done by dividing the Es by 4. That's all I know. Stuff I found on Google. Others may have other methods and some explanation.

Steve.

scott/r
Posts: 887
Joined: Wed Aug 27, 2014 8:22 pm
Location: far north brisbane

Re: Es and Sd

#3 Postby scott/r » Sun Jan 22, 2017 9:52 am

Cool, thanks Steve.
I did a google search and found a calculator that also gives you your percentage forcasts as well. Which is the reason for sd figures, so I just read.
http://www.calculator.net/standard-devi ... lator.html

scott/r
Posts: 887
Joined: Wed Aug 27, 2014 8:22 pm
Location: far north brisbane

Re: Es and Sd

#4 Postby scott/r » Sun Jan 22, 2017 1:01 pm

What is an acceptable number for 155.5 bergers? I've got a reading of 4.55 from this calculator. Am I in the ballpark?

plumbs7
Posts: 1124
Joined: Wed Feb 12, 2014 7:32 am
Location: Dalby/ Tara Rifle Club

Re: Es and Sd

#5 Postby plumbs7 » Sun Jan 22, 2017 9:48 pm

Hi Scott , sounds about right over 10 shots . Regards Graham

scott/r
Posts: 887
Joined: Wed Aug 27, 2014 8:22 pm
Location: far north brisbane

Re: Es and Sd

#6 Postby scott/r » Mon Jan 23, 2017 4:19 am

Cool, thanks Graham.


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