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Find variance and standard deviationof anyrondomvariable x |
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Answer» So the VARIANCE of X is the weighted average of the SQUARED deviations from the mean μ, where the weights are given by the probability FUNCTION pX(x) of X. The standard DEVIATION of X is defined to be the SQUARE root of the variance of X. That is, sd(X)=σX=√var(X). |
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