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Random Variableshard
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A continuous random variable XXX has the survival function S(x)=P(X>x)=11+x2S(x) = P(X > x) = \frac{1}{1+x^2}S(x)=P(X>x)=1+x21​ for x≥0x \ge 0x≥0. Is the expected value E[X]E[X]E[X] finite?