Excel 2003 SP2

I'm trying to take a numerical average of a selection of cells, defined by
the value of another column of the row the data is in.

Here's an example:

group score
a 6
b 4
b
a 6
c
b 8
c 6

total 6
count 2
avg 3

I want to know what the average for all scores in group "c". I can add them
all up using SUMIF, and I can count the number of "c"s using COUNTIF, but if
I have a blank cell (as in the example above) the average is incorrect. How
can I find the average for all "c"s where there is data in the adjacent cell?
(thus making the average in the above example 6!)

Many thanks.


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