Let's suppose now that the variable Age has three numerical states.
As it's a numerical node, its monitor will have a Mean value, a Standard Deviation and an Expected Value.
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 When the states do not have any associated values, $V_s$ is automatically set to the numerical value of the state. 
Otherwise, the state values defined by the user are used:
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 The Mean value $m$ is computed with the following equation: $$m = \sum_{s \in S} p_s \times c_s$$ where $c_s$ is the numerical value of the state. 
