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 Mode:  The number that occurs most frequently in a set of numbers.

Same but Different: Compare volume and surface area of solids.

Mean, Median, and Mode: Is One Always Larger?: Compare the relative size of different measures of center in various data sets.

Transformations of Data: Explore what changes in the mean, median, and mode as you add, subtract, multiply, and divide elements in a data set.

Combining Data Sets: Examine changes in measure of center when you combine groups of data.

Introducing Outliers: Observe changes in the mean, median, and mode of a data set as you introduce an outlier.