What is the variance of the number of tries for these 40 students? Problem 4 A lottery player decides to use a random variable generator to help him decide how many tickets to buy. He generates a discrete uniform random variable N taking values of 1 through 5 with equal probabilities 1/5, and then purchases N lottery tickets. If each of the tickets he buys has (independently of the other tickets) the probability p of winning, calculate the mean and the variance of the number of winning tickets the player buys