averageif for a range of values in another column

[-ken]

I need to take the average of colum A for the cells that have either a 1 or a
2 in the corresponding rows of column B. How do I do this?

 

[Ken Johnson]

I need to take the average of colum A for the cells that have either a 1 or a
2 in the corresponding rows of column B. How do I do this?

One way, for first 100 rows...

=SUMPRODUCT(A1:A100,--((B1:B100=2)+(B1:B100=1)))/SUMPRODUCT(--
((B1:B100=2)+(B1:B100=1)))

Ken Johnson

 

[T. Valko]

Try this array formula** :

=AVERAGE(IF(B1:B20={1,2},A1:A20))

** 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.