a) What is the difference between local balance and global balance?

b) Suppose that one observes a Poisson process with a packet arriving, on average, every I msec. Suppose futther that no packet has arrived for 5 consecutive milliseconds. How does this fact affect the probability of seeing an arrival during the next millisecond?

c) Suppose that one observes a Poisson process with a packet arriving, on average, every 1 msec. Suppose that it is t=0. Calculate the probability that the first arrival occurs within 3 msec.

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