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Find the expected value for the random variable. z 12 15 18 21 Hoi 9 0.14 P(z) 0.21 0.37 0.19 0.09 Type E(z) to two

Find the expected value for the random variable. z 12 15 18 21 Hoi 9 0.14 P(z) 0.21 0.37 0.19 0.09 Type E(z) to two decimal places

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