# Excel/Excel Formula

Question
I do not understand offsets, arrays, etc. and need help with you being able to write the formula that applies to my situation.  I am thanking you greatly in advance because I am stuck.
I have golf scores in AA11:AA500 with some cells not having data.
78,78,  ,80,77,  ,  ,  ,78, etc.
I am trying to pull the last 20 non zero values starting from AA11 and put them in cells C11,C12, etc.
I am then needing to take the lowest 10 of those 20 and getting an average.
If you can get me the last twenty scores I can probably inefficiently get the average of the lowest 20.
If you can aacomplish the average in a single formula, that would be appreciated also.
Thanks again.
Harold Buchanan

In cell A10, enter:

600

In A11:

=MAX(IF(\$AA\$11:\$AA\$500>0,IF(ROW(\$AA\$11:\$AA\$500)<A10,ROW(\$AA\$11:\$AA\$500),0)))

as an array. I.e., after typing the formula, instead of hitting Enter key, hit Ctrl-Shift-Enter.

In B11:

=INDIRECT("AA" & A11)

Copy A11:B11 down through A11:B30.

In C11:

=C10+1

In D11:

=SMALL(\$B\$11:\$B\$30,C11)

Copy C11:D11 down through C11:D20.

In D10:

=AVERAGE(D11:D20)

Col A is techie. Col B is the last 20 non-zero scores in the range AA11:AA500.
Col C is techie. D11:D20 are the lowest 10 scores from col B. D10 is the average of these 10.
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#### Stuart Resnick

##### Expertise

I can answer questions relating to MS Excel formulas, or to programming with vba (Visual Basic for Applications) in the Excel environment. Please follow the following guidelines: your question should focus on one specific issue you want to learn. It's beyond the scope of this free service for me to create entire projects or complex vba solutions for you from scratch. You should be able to do most of the work yourself, and come here when you need help with a specific point you're stuck on. ALWAYS include a simple, concrete example illustrating what you want to learn. Explain this example in detail in the text of your question (what data is in which cells of which sheets, etc). Be very precise about the results you want, using this sample to make the logic clear. Always keep these examples SIMPLE. Never e.g. use 18 worksheets in your example if using 2 or 3 will do. Never use ranges like AI567:BB865 if using a range like A1:B3 will do. Thanks.

##### Experience

As a consultant, I've designed Excel tools since the 90s, working for the Federal Reserve Bank, AT&T, and (currently) Gap Inc.

Education/Credentials
My only "education" comes from 2 decades of doing spreadsheet/programming work, with major SF Bay Area corporations such as AT&T, Federal Reserve Bank, and Gap Inc.