Each active user on the link needs 3Mbps bandwidth. There are total 40 such users wanting to get connected, where each user will be active with probability p=0.2, all going through a link of 22Mbps. Under packet switching, write down the probability that there are k active users out of 40 assuming k = 0, 1, ..., 40. What is the average number of active users? What is the probability that the link is actually overloaded, when all the 40 users are in the network