Try one of these:

This is an array formula** :

=AVERAGE(IF(ISNUMBER(A1:A3),A1:A3))

** array formulas need to be entered using the key combination of
CTRL,SHIFT,ENTER (not just ENTER). Hold down both the CTRL key and the SHIFT
key then hit ENTER.

Or, this normally entered formula:

=SUMIF(A1:A3,"<1E100")/COUNT(A1:A3)

--
Biff
Microsoft Excel MVP


"Rahim" wrote in message
...
I want to tell excel that IF A2 has "#N/A", AVERAGE (A1,A3), A2
but it don't work, any help is highly appreciated, thanks