Bar Chart of student performance - Tableau

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I have this dashboard. In sheet two , the bar chart is just counting the number of marks in each range specified in the x-axis. What I actually want is a bar chart according to the same range, but it should count the average or marks of each student. In sheet 3, the bar chart looks similar to what I expect, but if you take a look, it's just adding each average of student one above the another.

So, how can I make a char bart with frequency of students average of marks. The ranges should be: [0 , 5>,[5,10>, [10,15>, [15,20].

asked 37 secs ago

CreamStat

198