6. Define or state the expected value of a discrete random variable X (E(x) is given as____).
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Expert's answer
2020-06-30T11:46:27-0400
By definition, a random variable X is called discrete, if it can take only countable number of values. Suppose that X takes values xi with probabilities pi, ∑i=1+∞pi=1 . Then its expected value is (see e.g., https://en.wikipedia.org/wiki/Expected_value) E[X]=∑i=1+∞xipi .
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