=AVERAGE(IF(C1:C1000,C1:C100))

which is an array formula, it should be committed with Ctrl-Shift-Enter, not
just Enter.

--
HTH

Bob Phillips

(remove nothere from email address if mailing direct)

"Joker" wrote in message
...
I'm looking for a formula to find the average of numbers in a column that
are
greater than 0. For example, in column A, there are reaction times. In
column
B, there are final times. Say cell A1 is 3:25 AM and cell B1 is 3:45 AM.
In
cell C1, I have the formula =B1-A1 to give me the amount of time in
between
B1 and A1. The formula is copied down the column giving the cells the
value
of 0. I need to find the average final times but without the 0 values. Any
help would be greatly appreciated. Thank you