It seems like you're trying to get an "average customer number". Can that be right?
If you're trying to find an average of Days in Table1 of Customer Summary worksheet, then a more likely formula would be:
=AVERAGEIF( 'Customer Summary'!Table1[Days], "<>0")
Trying to average customer days past due looking at the customer #'s on a different tab same spread sheet.
Range - Tab: Current AR, Table (column - Customer #)
Criteria - Customer Summary [Tab with this formula] looking at column A2
Average Range - Tab Current AR, Table (Column - Days)
Maybe you could give an example of the kinds of data that you're looking at and what you expect to see. I don't follow the bit about "looking at the customer #s on a different tab". It seems to me that your formula is simply formed improperly. The first argument that your formula needs to see is the range of "days" that it needs to average. If you're going to look at "some days" or "some customers", then that's part of the criteria, not the range.
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