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You can use LODs for this. Create a calculated field to count the number of student id occurences:
You can drag that field to dimensions and use it as a dimension. You can also group it, something like:
IF [Above Calc] = 1 THEN '1'
ELSEIF [Above Calc] < 4 THEN '2-3'
That should give you what you need to create a bar graph
Exactly what I was after.