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Answers and rating deltas for

what does this javascript on keeping score for quiz mean?

Author Votes Δ
Raghu 1 +1.90
Priyanka L Verma 1 +1.86
Luis González 1 +2.17
sagar2901 0 -3.14
Harsha Biyani 0 -2.79
Last visited: Apr 19, 2016, 10:53:29 PM