2. Compute E(x) and \sigma(x) if x follows the following probability distribution \begin{tabular}{|c|c|c|c|c|c|} \hline x & 5 & 1 & 2 & 3 & 4 \\ \hline p(x) & 0.2 & 0.3 & 0.1 & 0.1 & --- \\ \hline \end{tabular}
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