Pasquist Water Company$($PWC$)$ operates a$24-$hour facility designed to efficiently fill$$ water$-$hauling tanker trucks. Trucks arrive randomly to the facility and wait in line to access a wellhead pump. Since trucks vary in size and the filling operation is manually performed by the truck$$ driver, the time to fill a truck is also random.

Part $2$

a$.$ If the manager of PWC uses the$$ "multiple$-$server model" to calculate the operating characteristics of the$$ facility's waiting$$ line, list three assumptions she must make regarding the behavior of waiting trucks and the truck arrival process. $($Check all assumptions that$$ apply.$)$