-
Consider the experiments: First
draw a Poisson random variable N with parameter ?. Then perform N independent Bernoulli trial each with success
probability p. Let Z be the total number of successes in the whole
experiment. What are the mean and variance of Z? -
Suppose that X and Y are independent exponential random variables each
with rate ?. What is the conditional probability of
X, given that Z = X + Y = z?





