(Answered) Question all voters of milwaukee county were asked a week

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Question: All voters of Milwaukee County were asked a week before election day whether they would vote for a certain presidential candidate. Of these, 48% answered yes, 45% replied no, and the rest were undecided. If a yes answer is coded 1, a no answer is coded -1, and an undecided answer is coded 0, find the mean and the variance of the code.

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