单元格中的动态平均（Excel 2016）

Question

I have problem with dynamically average calcuation.

...after adding (I change Average manually)

In my Excel file I have users with some values and I'm every month adding new values and there is also Average that must increase. Now I edit this manually but I want to do that automatically. Is it possible? How should be the formula for this?

Note that I cannot move cells.

Answer 1

First of all move the column with the average to a place where you don't need to move it anymore. Probably P column if you need to get all months in there.

Then in the P2 cell add this formula

=SUM(D2:O2)/COUNT(D2:O2)  

This will first sum the range and then divide by the number of entries you have in the range.

However, this part: also Average that must increase is nothing that a formula can handle.
It will only calculate the average, sometimes it may increase and sometimes it will decrease.

Answer 2

As stated above, you should move the average calculation else where.

Another approach is to create a named ranges.

For John, we will use following formula for named range definition and call it JohnAvg , this is generic formula for dynamic range, it will expand for the defined line automatically, considering you have only the months data you want to average there:

=$D$2:INDEX($2:$2;COUNTA($2:$2))

Then, the formula for calculating John's average is:

=AVERAGE(JohnAvg)

Answer 3

=AVERAGE(OFFSET(F2,0,4-COLUMN(),1,COLUMN()-4))

(Written to start in cell F2 )

This will use OFFSET to create a Range that starts in Column 4 (D) and extends until the Column before the Cell that the formula is written in.