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Variance
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Variance
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of a Random Variable X
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of a Discrete Variable Formula
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in Statistics Maths
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Variance
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6:26
Khan Academy
Variance and standard deviation of a discrete random variable
We learn how to calculate the mean and standard deviation of a discrete random variable. The concept of a random variable is explained, along with methods to calculate its expected value (mean) and measure its spread (variance and standard deviation). A practical example makes the concept easier to understand.
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