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Currently struggling with a lecture question, any help would be greatly appreciated, thank you so much! Let X be a random variable which takes on

Currently struggling with a lecture question, any help would be greatly appreciated, thank you so much!

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Let X be a random variable which takes on the following values: with probability 1/2;7 X = with probability 1/4; 3 with probability 1/8; a with probability 1/8. Determine a so that E(X ) = 4

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