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Average Calculator Problems

Hello everybody, I’m having some issues performing an ‘average grade calculation’.
My goal is to have some input fields where students can enter their grade and weight/count of the grade. The average has to be calculated according to this.
I tried working with an expression, but the way I set it up, apparently needs all input fields to be filled.

Is there a possibility to have the calculations being performed ‘live’. So without a button saying ‘calculate’?

Thanks in advance!

Already Solved, but i do encounter another problem atm. Check my activity for it.