A jar contains 11 red marbles, 12 blue marbles, and 6 white marbles. Four marbles from this jar are selected, with each marble being replaced after each selection. What is the expected number of draws until the first red marble? Since about half of the marbles are red, 2 draws is expected until a red marble is drawn.
Since there are 3 colors of marbles, 3 draws is expected until a red marble is drawn.
Since StartFraction 11 Over 29 EndFraction of the marbles are red, StartFraction 11 Over 29 EndFraction draws are expected until a red marble is drawn.
Since StartFraction 11 Over 29 EndFraction of the marbles are red, StartFraction 29 Over 11 EndFraction draws are expected until a red marble is drawn.