The density function of X is f (x) = 32x3, x 4. The expected value of X is 2.

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The density function of X is f (x) = 32x−3, x ≥ 4.

The expected value of X is 2.

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The density function of X is f (x) = 32x3, x 4. The expected value of X is 2.

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