This might be a simple question, but I can't seem to wrap my head around it. I have a table which can be simplified to the one below:
I want the average score for my selections which I can get by using a simple Avg(Score). When I select Class = A and Group = 2 then my Avg(Score) will give me 20. How can I get the average for the scores in my selected Class (A), but for the Groups which are not in my Group selection (1 and 3). In other words, when I select the class and group in green in the table below, I want to get the average of the blue values (=(10+50)/2=30).