Frequency tables and dot plot videos
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/dot-plot/v/frequency-tables-and-dot-plots
https://learnzillion.com/lesson_plans/7266-construct-a-dot-plot/handout
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6-shape-of-data/v/examples-analyzing-clusters-gaps-peaks-and-outliers-for-distributions
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/histograms/v/histograms-intro