[volt-nuts] Willy; averaged values

[Jan Fredriksson]

Willy,

Correct, with important assumptions:

- that the uncertainty of each one is randomly independent of the other.
- i think one also assumes the overall uncertainties have to have a
Gaussian distribution.
If you grab a handful of components / units, they may, or may not, show
independently random distribution of values, depending on manufacturing.



> I was told that the uncertainty goes down with the square root...?
> That would mean 4 standards averaged together would cut the error in
> half...
> And 9 would cut it to one third.
> Is this correct? If not, what is the formula?
>
> Willy
>