Need Maths Forumla. % Error

Seem that im getting the "chemisty" % erros forumula as I call it.

I had to go out so couldnt type that much detail

So here is more detail...Probably better if I just give you the excel file.

Anyone wana host it for me.

Its bascialy I have some results that I have averaged out and I need to find the %error in that average.

Iv used the average again with some more averages so you can see that there will be some % error in those numbers.
 
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