2. At Bobcat Jensen’s grocery store, there has been a pandemic-induced rush on certain goods, such as • T: packages of toilet paper • W: packages of disinfectant wipes The following joint distribution shows how many packages of toilet paper and disinfectant wipes a shopper can obtain per visit. Compute the requested probabilities for one shopping visit. T 0 1 2 3 W 0 0.31 0.22 0.09 0.04 1 0.15 0.05 0.04 0.01 2 0.04 0.03 0.01 0.00 (a) probability that zero packages of toilet paper and zero packages of disinfectant wipes are purchased (b) expected number of packages of toilet paper purchased (c) standard deviation of packages of disinfectant wipes purchased given that exactly one case of toilet paper was obtained