Interactive Dot Diagram(with Illustration of Mean, Median)

Drag the green triangles △ on the horizontal axis to interact with the dot plot., ie change the values of the data set. Use the slider to increase or reduce the number of items in the data set. Use the checkboxes to show the median or the mean values and their positions.
Make one value very very small or very very large. This is called an extreme value of the data set. 1) What is the effect of the outliers(extreme value) on: a) Mean b) Median 2) Why does extreme values affect one more than the other ?