How to create a rate system (per row) and show users only the average?

Hi, I’m quite new to AppSheet, help would be very appreciated!
I’ve created an app for my school based on a google sheet (which takes files upload with a Google Form) and organises them. Using the Publisher Pro Plan.
I’m currently trying to implement a rating system, which allows users to give a score (1-5), for each file uploaded (row) and then calculate and show the average of values (for each file).
What’s the most efficient way to do so?
Please be as clear as possible in the answer, so that I can follow your advices easily.
Thanks for your time.
Chiara

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