​Todd's Direct, a major TV sales chain headquartered in New​ Orleans, is about to open its first outlet in​ Mobile, Alabama, and wants to select a site that will place the new outlet in the center of​ Mobile's population base. Todd examines the seven census tracts in​ Mobile, plots the coordinates of the center of each from a​ map, and looks up the population base in each to use as a weighting. The information gathered appears in the following table.