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Variance and standard deviation of a discrete random variable | AP Statistics | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/ap-statistics/random-variables-ap/xfb5d8e68:mean-standard-deviation-random-variables/v/variance-and-standard-deviation-of-a-discrete-random-variable Finding the variance and standard ...
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