Ex.7: Let us assume a probabilistic version of the Eager Reliable Broadcast protocol in which every process retransmits a rb-delivered message only once with probability 0.5. The rb-broadcast operation is periodically triggered, and the calls follows an exponential distribution with average time between consecutive calls of 10 seconds. Assuming a distributed system of 30 processes and no processing delay, what is the minimum in-channel capacity per process (in terms of message per seconds) to ensure that the expected time for a rb-delivery is below 0.5 seconds?