Any official act or decision of the board shall be concurred in by a majority of its members present at a meeting. Such act or decision shall be based upon information presented to members present at official meetings of the board. There shall be at least a quorum of the board members present at any official meeting of the board. Private solicitation of individual members in an effort to in any way influence their official actions through information or arguments not simultaneously presented to other members of the board is improper.