Find the expected value of a random variable $x$ having the following probability distribution.
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\(E(x) = x_1P(x_1) + x_2P(x_2) + \cdots + x_nP(x_n)\)
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Step 1 ：\(E(x) = \sum xP(x)\)
Step 2 ：\(E(x) = x_1P(x_1) + x_2P(x_2) + \cdots + x_nP(x_n)\)
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