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 Measures of Central Tendency:  Numerical values used to describe the overall clustering of data in a set, or the overall "average" of a set of data. The three most common measures of central tendency are the mean, median, and mode.

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.

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

Analyzing Test Scores: Find the Standard Deviation and Variance for a set of test scores.