Select the value more approximated to the mean

[Sunshineeee]

Hello!

I am currently doing a code and just stopped at a part where it needs to select the value from a list (which I already set) that it is more approximated to the mean.

Is there a signal to put on after If value ... mean or Is there other way to do this?

Thank you in advance!

[Sunshineeee]

Hope I am being clear in describing what I am looking for and sorry if this bores you as it may sound too simple for experts.
I'd appreciate your help.