In a meeting, 70% of the members favour and 30% oppose a certain proposal. A member is selected at random and we take X = 0, if he opposed, and X = 1, if he is in favour. Find E(X) and Var (X).

Question

$\begin{array}{1 1}E(X) = 0.7, V(X) = 0.21 \\E(X) = 0.7, V(X) = 0.49 \\ E(X) = 0.7, V(X) = 0 \\ E(X) = 0.7, V(X) = 0.14\end{array}$