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Let X be random variable with probability density function f(x) = \(\begin{cases}\frac{2}{x^3}&x≥1\\ 0&x<1 \end{cases}\)Which of the following statement is correct (a) both mean and variance exist (b) mean exists but variance does not exist (c) both mean and variance do not exist (d) variance exists but mean does not exist |
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Answer» (b) mean exists but variance does not exist |
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