3. Suppose that the customer arrivals at an automatical teller machine (HIM) can be described by a Poisson process with rate 1. nd the service times at the HIM are i.i.d. expt]. Also, suppose that a potential customer will enter service with the M'M only if the ATM is free when she arrives. That is, if there is already a customer at the ATM, then our arriver, rather than waiting for the MM service, will leave. A special customer, who knows how the system works, wants to use it in a different wajt He inspects the KIM at times 0, T, 21\