6.2: Measures of Central Tendency

7.SP.4 Use measures of center and measures of variability for numerical data from random samples to draw informal comparative inferences about two populations.

https://www.khanacademy.org/math/probability/data-distributions-a1/summarizing-center-distributions/e/mean_median_and_mode

http://interactivesites.weebly.com/mean-median-and-mode.html

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