A ball is drawn from a bowl containing 2 red, I blue, and 7 black balls: The ball is replaced, and a second ball is drawn, and so on until 3 balls have been drawn (sampling with replacement).
(a) Let X = the total number of red balls drawn. Tabulate its probability function. Find p and as. Graph. (b) Repeat (a), for Y = the total number of blue balls drawn.