Calculating the Average of Subtotals in Excel with a formula

2015_Orders_upload.xls

So I have a list of orders which have several line items.  I want to subtotal the orders so I can get an accurate count of the number of orders, then also get the average number of books per order and the average number of titles per order.

I was trying to do this with a sumif, then get an average using countif, but I can't get the sumif statement to work.  I was wanting to have it add the values if their formulas contained "=subtotal" to eliminate all of the other data.

I saw another post where someone did this as a macro, but when I tried to use that, I kept getting an 'out of memory' error unless I only did like 100 rows at a time.  With 15,000 rows, that seemed a bit tedious.

Any suggestions?
lindemrmAsked:
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Saqib Husain, SyedConnect With a Mentor EngineerCommented:
Try these formulas for sum and count respectively

=SUMPRODUCT((RIGHT(A2:A16575,5)<>"Total")*D2:D16575)
=SUMPRODUCT((RIGHT(A3:A16576,5)<>"Total")*1)
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lindemrmAuthor Commented:
That's a different was to approach it, but it sure is simple and works.  Thank you.  I feel like kind of a schmuck for not coming up with that one on my own.
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