How to decimate temporal data in Excel? That is to reduce the number of
samples to the minimum significative number.

I am doing so by hand averaging groups of x-samples and checking visually if
the data to be averaged is significative to the meaning or simple noise.

Doing so over a large number of data is more than cumbersome, it is a
non-sense. I can code it but I need to teach to students how to decimate and
they don't necessarily know how to code.

Thank you very much for your help