At time t 0 you begin counting the arrivals of buses at a


At time t = 0, you begin counting the arrivals of buses at a depot. The number of buses Ki that arrive between time i - 1 minutes and time i minutes, has the Poisson PMF

And K1, K2,... are an iid random sequence. Let Ri = K1 + K2 +···+ Ki denote the number of buses arriving in the first i minutes.

(a) What is the moment generating function φKi (s)?

(b) Find the MGF φRi(s).

(c) Find the PMF PRi(r).

(d) Find E[Ri] and Var[Ri]

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Basic Statistics: At time t 0 you begin counting the arrivals of buses at a
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