I am using Moodle 1.8.2+ and let's say I have 100 students out of which only 20 have given a quiz which is graded. When I check the grade of a student and click on the Total Stats link I get some information on Average, Median etc. This is skewed as 80 students have not taken the quiz. How do I exclude the 80 students while calculating the Total Stats?
Quiz
Total Stats Clarification
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