Wis. Stat. § 181.0824: Quorum and voting.

(1) Quorum. Except as otherwise provided in this chapter, the articles of incorporation or the bylaws, a quorum of a board consists of a majority of the directors in office immediately before a meeting begins.

(2) Voting. If a quorum is present when a vote is taken, the affirmative vote of a majority of directors present is the act of the board unless this chapter, the articles of incorporation or the bylaws require the vote of a greater number of directors.