4. There are X candidates for becoming a Jedi youngling where X is a poisson random variable with parameter A. Each candidate can complete his/her training with probability p. If we let W denote the...

Extracted text: 4. There are X candidates for becoming a Jedi youngling where X is a poisson random variable with parameter A. Each candidate can complete his/her training with probability p. If we let W denote the difference between the number of candidates who can complete the Jedi training and the number of those who cannot complete the training (the former minus the latter); (a) Compute E[W]. (b) Compute variance of W.