not use excel

- In a certain experiment, from a box containing 2 green balls and 4 black balls, 3 balls are drawn in succession, each ball is returned to the box before the next one is drawn. a) Find the probability distribution for the number of green balls. b) Using the probability distribution of literal a, calculate the expected value of g(X) "the 3 balls are always black". if g(X) is given by the following graph: 5 -2