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SUBMIT YOUR IDEAIt was a real challenge, as I have never used the multi-field formula to calculate a running average and I had learnt a lot.
However, I think the output required was not clear and it had a wrong format, so I have changed the output in my final solution. Here is a preview of how I think it should have looked like:
This one took a little creative renaming so I could keep track of the type of average. The original output was a little tough to digest. But it was great practice. :)