I know there are already a few questions about averaging in excel on the SE, but I looked at them and didn't really understand what to do (I'm just starting using excel)...

I have a file with columns of numbers like that :

And I would like to average on each row over the columns, meaning to take the average for the first line (2455.93+930.0.654+...)/7, for the second line (1434.56+9443.026+...)/8 . I know how to do it line by line but I don't know what would be the formula to do it for all the rows all at once plz.

Thx in advance