Specifically, the polygons are Voronoi/Thiessen polygons created from the points, and I want to find the average distance from within the polygon to the point within. A more general solution is welcomed.
If this is confusing, you may think about it as points evenly and infinitely distributed within a polygon, each having their own Euclidean distance to the point. I could perform an analysis on each polygon in this manner, but would much prefer a simple calculation that could be performed systematically (within Excel, for example).