**Measures of spread: range, variance & standard deviation ...**
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/variance-standard-deviation-population/v/range-variance-and-standard-deviation-as-measures-of-dispersion

Mar 03, 2016 · Measures of spread: range, variance & standard deviation (video) | Khan Academy. Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501 (c) (3) nonprofit organization. Donate or …

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