The sample size (N), the mean, the median, and the skew are displayed to the left of the histogram. The mean is also indicated by a blue line under the X-axis; the median is indicated by a purple line. The beginning values of the mean and median are both 70.
You can change the distribution by "painting" the histogram with the mouse. Create positively and negatively skewed distributions and note the effect on the relative size of the mean and median.