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Find the expected value for the random variable. Z 9 12 15 18 21 D P(z) 0.12 0.22 0.41 0.16 0.09 E(z) (Type an

Find the expected value for the random variable. Z 9 12 15 18 21 D P(z) 0.12 0.22 0.41 0.16 0.09 E(z) (Type an integer or a decimal.) +

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