# Question

Derive a formula expressing the variance of a random variable in terms of its factorial moments.

## Answer to relevant Questions

Two players compete against each other in a game of chance where Player A wins with probability 1/ 3 and Player B wins with probability 2/ 3. Every time Player A loses he must pay Player B $ 1, while every time Player B ...Suppose HX( z) is the probability- generating function of some random variable X with PMF PX( k) . In terms of PX( k) , find the PMF of the random variable Y if its probability- generating function is given as in each of the ...Prove the following properties of moment- generating functions. (a) MX (0) = 1. (b) For a nonnegative random variable X, and for real u < 0, MX (u) ≤ 1. The average number of cars per hour arriving at a toll booth is 57 while the standard deviation is 15. (a) Use Markov’s inequality to find an upper bound on the probability of having more than 200 cars arrive in an hour. ...Suppose a fair coin is flipped n times and the random variable Y counts the number of times heads occurs. What is the entropy of Y in bits? Compare your answer to that of Exercise 4.85 and explain any difference.Post your question

0