Atotal of 30 bears consisting of 10 red bears, 10 yellow bears, and 10 blue bears are randomly arranged in a bucket. a child begins grabbing the bears at random, with all selections equally likely. the bears are selected "without replacement", i. e., she never puts the bears back after she grabs them. let x denote the number of bears that she grabs before the first red bear appears (but not including the first red bear itself) 3

a. find e(x) 3
b. find var (x)