Using SUMPRODUCT to calculate averages from a closed workbook

Welcome (back) to the forum.

Thanks for your question. However, we have just found out that you have posted the same question elsewhere.... and haven't told us. Feel free to cross-post on other sites...

But. Every forum has its rules. Please see Forum Rule #3 about cross-posting. So.

Do not keep it a secret. We all are willing to give you our time, freely. However, some of us get very annoyed if we waste our time developing a solution for you, when you already have a nice solution elsewhere. All we ask is that you show us some respect and tell us:

1) if you have cross-posted, and

2) the URL of the cross posts.

That way, those of us who don't want to waste their time can quickly check to see if you're already happy with another solution.

(Note: this requirement is not optional. No help to be offered until the link is provided.)