A teacher uses five marbles in a flat rectangular container to illustrate concepts of thermodynamics. The container has a line painted down the center splitting the container into equal left and right sides. The container is set on a vibrating platform so that the marbles are constantly in random motion. The marbles can easily cross the painted line. The teacher takes a snapshot of the ten marbles every few seconds. For each picture the students count the number of marbles on the right side of the container. They plot their results on the frequency graph above.
Which statements can be drawn from the graph?
Select TWO answers.