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Drawing a new set of data

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In my school, we invited five judges to give a mark to every musicial performers.

However, their judging systems are not identical, even there's an unallowable discrepancies among the data.

This gives rise to a large standard deviation for one examiner and a small one to some others.

Should I reconcile the discrepancies but reducing the standard deviation by means of packing the graph along the x-axis more closely? how do you handle it?

I have no idea but I undertake the task for I forsee unfair matter would rise after the announcement.

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