5 percent of the routes (all of quartile 4 and most of quartile 3) is not enough to cover the costs of the mail delivered on those routes.
All routes cover their own cost of operating.
mnli hypothesis: All routes cover their own cost of operating. premise: 5 percent of the routes (all of quartile 4 and most of quartile 3) is not enough to cover the costs of the mail delivered on those routes.