4.1 says that N station share a 56 kbps pure aloha channel. Each station outputs a 1000-bit frame on an average of once every 100 microseconds, even it the last one has not beeen sent. What is the max value of N?

First compute the usable bandwidth of aloha.

Seonds, compute the bandwidth requirement of each station.

Finally divide the aloha bandwidth by the average bandwidth requirement for each station