A bar graph is shown. The x-axis is labeled 1 through 9 and the y-axis is labeled 0, 5, 10, 15. Bar 1 is 2 units high, bar 2 is 4 units high, bar 3 is 6 units high, bar 4 is 8 units high, bar 5 is 10 units high, bar 6 is 8 units high, bar 7 is 6 units high, bar 8 is 4 units high, and bar 9 is 2 units high.
Which of the following statements is true about a graph that is perfectly symmetric, such as the one above?

The mean is greater than the median.

The mean is equal to the median.

The mean is less than the median.