Average charges
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
"Average charges for toll and transportation" are understood to mean, and do mean, charges made at a mean rate, obtained by dividing the entire receipts for toll and transportation by the whole quantity of tonnage carried, reduced to a common standard of tons moved one mile.
Hersh v. Railway Co., 74 Pa. 190.