https://www.teacherspayteachers.com/Product/Media-Mediana-Moda-Rango-Mean-Median-Mode-Range-Spanish-363193
http://forum.wordreference.com/threads/mean-median-mode-range-matem%C3%A1ticas.22097/
http://www.ehowenespanol.com/cuales-son-definiciones-media-mediana-moda-info_173730/
http://www.bbc.co.uk/bitesize/ks2/maths/data/mode_median_mean_range/read/2/
http://math.about.com/od/statistics/a/MeanMedian.htm
http://www.math-aids.com/Mean_Mode_Median/
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