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Random Variablesmedium
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A continuous random variable XXX has the probability density function (PDF) f(x)=c(1−x2)f(x) = c(1 - x^2)f(x)=c(1−x2) for −1≤x≤1-1 \le x \le 1−1≤x≤1, and f(x)=0f(x)=0f(x)=0 otherwise. What is the variance of XXX?