题目内容

Given the conditional probabilities in the table below and the unconditional probabilities P(Y=1)=0.4 and P(Y=2)=0.6, what is the expected value of X x i P(x i |Y=1) P(x i |Y=2) 3 0.7 0.2 4 0.3 0.8

A. 3.2
B. 3.3
C. 3.6

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