We are preparing a spreadsheet that needs to have a running monthly average.
For example, the last quarter of 2008, I need a formula that will average all
September, then October, November, etc. Since I do not have any totals for
December, I set up a formula for Sept thru Oct, then change it to add Nov,
and will add the cells for December. Is there any way to set up a formula to
average my months even though my December numbers are not available without
having to update the formula each month? Thank you!!

Yes
But you need to convey more information - describe the layout of your
worksheet (what cells are used for data entry) and what formula are you using?

"kimmiep" wrote:

We are preparing a spreadsheet that needs to have a running monthly average.
For example, the last quarter of 2008, I need a formula that will average all
September, then October, November, etc. Since I do not have any totals for
December, I set up a formula for Sept thru Oct, then change it to add Nov,
and will add the cells for December. Is there any way to set up a formula to
average my months even though my December numbers are not available without
having to update the formula each month? Thank you!!