Suppose users share a 3 Mbps link. Also suppose each user requires 150 kbps when transmitting, but each user transmits only 8 percent of the time.

a) with circuit switching, how many users can be supported ?

b) Assume there are 120 users. With packet switching, what is the probability that there are more than 20 users transmitting at the same time?

(Attach screen capture of the binomial distribution calculator showing your inputs, and specify which of the outputs is the answer to the problem).