Remove all points by clicking on the trash. Place three observations on the line by clicking below it, two close together near the center of the line, and one somewhat to the right of those two. Pull the single right-most observation out to the right. (Place the cursor on the point, hold down the mouse button, and drag the point.)  

1. How does the mean behave?
2. How does the median behave?
3. Make sure you understand why each measure acts as it does.