Each redistricting board shall, within three months after official publication of each federal decennial census, meet at the call of the chairman to organize as provided in this chapter and to consider redistricting, unless the county commissioners are currently elected at large pursuant to subsection 3 of section 11-07-03 and neither a resolution of the board of county commissioners nor a citizen petition pursuant to this section has called for such meeting. A redistricting board may additionally meet during a census interim if a resolution calling for a meeting is passed by the board of county commissioners or a petition calling for a meeting signed by ten percent of the qualified electors of the county as determined by the number of votes cast for governor in the last gubernatorial election is presented to the board of county commissioners. If any one district in the county varies more than ten percent from the average population per commissioner in such county determined by dividing the total population of the county at the last federal decennial census by the number of commissioners’ districts in such county, or if county commissioners are elected at large, the redistricting board shall redistrict the county, as provided in this chapter. If redistricting of a county is required, the chairman of the redistricting board shall, not less than thirty days before the filing of the plan pursuant to section 11-07-03, call a meeting for the purpose of conducting a public hearing to review alternative plans for such redistricting. Notice of such meeting shall be published or caused to be published by the chairman in the official county newspaper at least ten days prior to the date of such hearing.