Marks Discrepency

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Tanu was going through exam marks of his class when he observed that some marks values occur frequently, whereas some of them do not occur at all. He suspects that teachers might be giving grace marks to uplift grade of those near the grade-cutoff, or maybe skipping partial marking. There are 5 subjects in the school, labelled A to E. Each student gets marks out of 100 (i.e., integer marks in the

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