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![\begin{align}
\operatorname{E}(X)& = 1 \cdot \frac{1}{6} + 2 \cdot \frac{1}{6} + 3 \cdot \frac{1}{6}
+ 4 \cdot \frac{1}{6} + 5 \cdot \frac{1}{6} + 6 \cdot \frac{1}{6}\\[6pt]
& = \frac{1 + 2 + 3 + 4 + 5 + 6}{6} = 3.5
\end{align}](https://upload.wikimedia.org/math/2/4/6/24646fc4acafeb6e961d3a2f29adefbd.png)
![\operatorname{E}[X] = \int_\Omega X\, dP](https://upload.wikimedia.org/math/d/f/1/df1fc745cf0d6851f8597cbf85cd5308.png)