Cells can be the reference to the cell range you want to count.
Say you want to count values in the cells from A2 to V20, then you
would do it this way:
What is the syntax of the AVERAGE function in Microsoft Excel?
The Average function can use numbers, cells or ranges or a mix
of these. IT can take up to 255 values. The general syntax is:
=AVERAGE(number1, [number2], ...)