how to do avg formula

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Attached is my file. I would like to do a formula for the average column which auto calculate monthly without me having to change the formula monthly.

Example: when I have already entered the feb expenses and the avg, is total/2, but come Mar expenses, there is a need for me to change : total/3.  Is there a better formula that I need not attend to edit for the average column.

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Use the AVERAGE() function.

use this:

=AVERAGE(B3:M3)

Put it into cell O3 and then copy the formula down to the rest of the cells.

This will update to give you the latest average at all times.

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