How do I calculate an average if

[Guest]

Using data from a separate spreadsheet, I am trying to calculate an average
based on criteria in another column in EXCEL. Here is an example, if results
are > 20, then how do I calculate average age? Spreadsheet (1) is call all
results and Spreadsheet (2) is called scores>20

A1=21 B1=18
A2=25 B2=15
A3=18 B316
A4=16 B4=15
A5=15 B5=14
A6=10 B6=19
A7=23 B7=14
A8=24 B8=17
A9=22 B9=16
A10=12 B10=15

 

[Guest]

Enter with Ctrl+Shift+Enter

=AVERAGE(IF(A1:A10>20,B1:B10))

Adjust for your data

HTH

 

[Peo Sjoblom]

One way

=SUMIF(A1:A10,">20",B1:B10)/COUNTIF(A1:A10,">20")


you can also do it with an array formula but I suspect this is more
efficient