#StackBounty: #uncertainty How many figures to quote a value and uncertainty

Bounty: 50

I run a calculation to obtain a value P.

In order to get some kind of idea about the uncertainty the calculation, I created 5,000 sets of simulated data and tried to find a value P for each one of them.

The results were that the mean value of P for the 5,000 tests was:


The standard deviation was:


I just want to be sure of the correct way to quote these values.

Should it be:

20.04 +/- 0.70 %


20 +/- 1 %

or maybe something else?

I’ve never quite understood this. Is it a matter of opinion or is there a correct way?

If you could provide reasoning along with the answer that would be great, thank you.

Get this bounty!!!

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