$3$pts$]$ A large factory uses computer numerical control $($CNC$)$ routers to produce parts, and each router draws between $30$ and $40$

kilowatts of power while in operation. That is all that is known about the power intake of a router so assume that a router's power

intake $($in kw$)$ is uniformly distributed on $[30,40].$

Suppose that $3$ routers are in operation at the same time and they draw power independently, with $$ the current power usage of the

first router, $$ the current power usage of the