PowerPivot Structured Reference for COUNTIF

[SerenityNetworks]

I simply want to count the number of students in a class. In my example, I have:
4 in Class 1,
3 in Class 2,
3 in Class 3,
6 in Class 4,
3 in Class 5, and
6 in Class 6.

I want to use the values in a Pivot Chart (as shown in the attached image). The formula I have now works, but it seems rather kludgy.
Class Size:=COUNTAX(FILTER('Table2',[Passed]="y"),[Class]) + COUNTAX(FILTER('Table2',[Passed]="n"),[Class]) + COUNTAX(FILTER('Table2',[Passed]="n/a"),[Class])

I imagine there is a better way to get the count of students in a class, but I'm struggling with the structured references syntax. Any help will be appreciated.

 

[SerenityNetworks]

Never mind. It took a long time of digging and testing of numerous formulas found in searches, but the following seems to be working fine.
Class Size:=COUNTAX(FILTER('Table2',[Class]),[Class])