If your signal is DC and the noise is anything other than DC, taking average is as good as any filter can do.
If the noise is 50Hz and signal is not 50Hz, use a 50Hz notch filer will be the right way.
If your signal is DC and the noise is anything other than DC, taking average is as good as any filter can do.
If the noise is 50Hz and signal is not 50Hz, use a 50Hz notch filer will be the right way.