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This Java applet shows how the relationship between the mean and the median
and illustrates several aspects of these measures of central tendency.
The applet begins by showing a histogram
of 9 numbers. As can be seen in the histogram, the numbers are: 3, 4, 4, 5,
5, 5, 6, 6, and 7. The mean
and median of the numbers
are both 5.0. The mean is shown on the histogram as a small blue line; the median
is shown as a small purple line. The standard deviation is 1.15. A red line
extends one sd in each direction from the mean. You can change the values
of the data set by "painting" the histogram with the mouse.
Below the histogram are shown: 

The means of these 5 quantities are displayed at the bottom of the screen.