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Let X be a nonnegative random variable

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#20. Let X be a nonnegative random variable. Prove that... (see attachment)

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The expert lets non-negative random variables.

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#20. Let X be a nonnegative random variable. Prove that

E[X] ≤ (E[X2])1/2 ≤ (E[X3])1/3 ≤ ...

Solution: If X is a random variable that takes the values x1, x2, ..., xn and ...

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