The number of customers waiting for gift-wrap service at a department store is an rv x with possible values 0, 1, l 3, 4and corresponding probabilities .1, .2, .3, .25, .15. a randomly selected customer will have 1, 2, or 3 packages for wrappingwith probabilities .6, .3, and .1, respectively. let y = the total number of packages to be wrapped for the customers waitingin line (assume that the number of packages submitted by one customer is independent of the number submitted by anyother customer).a. determine p(x = 3, y = 3), le, p(3, 3).b. determine p(4, 11).