Upvote:2
The average of anything is generally useless when one considers specific parts. (E.g. when Bill Gates enters a room, the average person there is a multi-millionaire.)
What you want is the narrowest width. But even that is useless: if there were some especially narrow part, the object could have been turned to the vertical plane to get through.
(Irreverent memories of Jerry Lewis trying to carry a long object sideways through a doorway.)