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Answers and rating deltas for

Why does one of these calculations return NaN when the others work as expected?

Author Votes Δ
CertainPerformance 5 +0.39
Shekhar 2 +2.81
Federico klez Culloca 1 -0.19
Bilal Siddiqui 0 -2.33
Slim 0 -2.11
Last visited: Jan 28, 2020, 3:24:22 AM