figure-calculation-of-the-expected-frequency-2.tex

\qquad
 \begin{tabular}{cccc}
\multicolumn{1}{c|}{$x_i$} & c($x_i$) & P($x_i$) & $c(x_i)\cdot$P($x_i$) \\ \hline
\multicolumn{1}{c|}{$x_1$} & 2        & 0.1      & 0.2                   \\
\multicolumn{1}{c|}{$x_2$} & 1        & 0.3      & 0.3                   \\
\multicolumn{1}{c|}{$x_3$} & 5        & 0.2      & 1.0                   \\ \hline
\multicolumn{4}{c}{$c_{\mathbb{E}}(X)=0.2+0.3+1.0=1.5$}                                
\end{tabular}