Linus is competing with a kid named Russell in an election. Lucy states that her most recent poll shows Linus has "99.8%" of the vote.

Later, Linus wins the election by a count of 84 to 83, for a total of 167 ballots cast.

In Lucy's earlier poll, if Linus got every vote, that would obviously be 100%. However, if just one kid voted for Russell, that would be 166/167 = 99.4%.

To even possibly achieve 99.8%, there would have needed to be about 500 votes cast. 499/500 = 99.8%.

Therefore, 99.8% is impossible to achieve with only 167 votes cast.