A discrete random variable X can take on only four values a1, a2, a3, a4 with respective probabilities

(i) What are the admissible values for the parameter ?????
(ii) For ai = i, find the value of ???? such that E(X) = 13∕4. For this value of ????, calculate the variance of X.

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3A-2 2-A2A-1 -4+5 4 4 4 4