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Answers and rating deltas for

Why this javascript code give me Nan in the last line of output? I need the reason please

Author Votes Δ
ankur1812 1 +2.64
Matthew 1 +2.58
Pritom K. Paul 1 +2.58
FBlade 0 -2.33
Tarukami 0 -1.93
Jacob 0 -0.44
Last visited: Nov 27, 2022, 9:27:33 PM