A bag contains 77 orange marbles and 21 green marbles. If a representative sample contains 33 orange ​marbles, then how many green marbles would you expect it to​ contain? Explain.
Because the ratio of orange marbles to green marbles is ___ in the​ population, the expected number of green marbles is ___ times the number of orange marbles in the representative sample. There should be ___ green marbles.