Question: Question regarding the overview session, so what does Y = Y (x1, x2) here means? And why does the random variable depends on X1 and

Question regarding the overview session, so what does Y = Y (x1, x2) here means? And why does the random variable depends on X1 and X2 ? What does U(x1, x2) = E(Y) means ? And what does V(x1, x2) = Var(Y) means ?

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