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Question A random variable X takes the values –2, –1, 1 and 2 but you do...

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A random variable X takes the values –2, –1, 1 and 2 but you do not know the probability distribution. Which of the following statements is true?

The expected value could be –1.5

The expected value could be 3

The expected value must be one of the values –2, –1, 1 or 2

The expected value must lie between -1 and +1

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