The reason I asked you to manually calculate and enter in the workbook the average you expect to see for a few example rows is that experience tells us that this whole process of answering requests is much helped if we know the end goal. It save a lot of to-ing and fro-ing and misuderstanding. We can test our ideas knowing what the result should be.
And incidentally there's no need to requote previous comments unless absolutely necessary for clarification.
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