# Mean, Median, and Spread

Change the values of any of the 9 blue data points by moving them horizontally with the mouse or by changing the numerical coordinates in spreadsheet column

**A**to the right. Select checkboxes and observe how the**Mean**,**Median**, and**BoxPlot**of the data set vary as an individual point is moved. Select**MAD**or**Variance**to move a slider giving an estimate of the "center"**M**as the spread is shown. When trace is also selected it is possible to recognize which values of**M**minimize**MAD**or**Variance**. You can also select**animate**to slowly vary**M**.## New Resources

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