Sanchez Trucking has been experiencing delays at its warehouse operations. Management hired a consultant to find out why service deliveries to local businesses have taken longer than they should. The consultant narrowed down the problem to the number of work crews loading and unloading trucks. Each crew consists of 7 employees who work as a team on a variety of​ tasks; each employee works a full 40 hours a week.​ However, costs are also a concern. The consultant advised management that they could supplement work crews with​ short-term employees, at a higher​ cost, to cover unexpected needs on a weekly basis. Each work crew permanently hired by Sanchez costs ​$3,500 per week in wages and​ benefits, while a crew of​ short-term employees costs ​$5,500 per week. Complicating the decision is the fact that the weekly hourly requirements for work crews is uncertain because of the volatility in the number of deliveries to be made. Deliberating with​ management, the consultant arrived at the following data.

(Data attached)

If the consultant wants to offer a solution that minimizes the expected weekly costs for​ Sanchez, how many work crews should Sanchez have on its permanent​ payroll?

A payroll containing ______ work crews is the lowest cost​ alternative, with expected weekly costs to Sanchez of ​$_____. ​(Enter your responses as​ integers.)
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