Question

I have an excel table with lets say 500 columns and 2 rows. I want to multiply each cell in the second row with the cell above, in the first row. Then get the average of the sum.

Example:

3 4 1 2 5
1 3 3 5 1

Solution would be: (3*1 + 4*3 + 1*3 + 2*5 + 5*1) / number of columns

What would the command look like in Excel?

Answer 1

For data in rows 1 and 2 use

=SUMPRODUCT(1:1,2:2)/COUNT(1:1)