An elementary experiment is independently performed N times, where N is a Poisson rv of mean λ. Let {a1, a2, ... , aK } be the set of sample points of the elementary experiment and let pk,1 ≤ k ≤ K, denote the probability of ak.
(a) Let Nk denote the number of elementary experiments performed for which the output is ak. Find the PMF for Nk (1 ≤ k ≤ K). Hint: No calculation is necessary.
(b) Find the PMF for N1 + N2.
(c) Find the conditional PMF for N1 given that N = n.
(d) Find the conditional PMF for N1 + N2 given that N = n.
(e) Find the conditional PMF for N given that N1 = n1.
Text Book: Stochastic Processes: Theory for Applications By Robert G. Gallager.