Let $X \in \text{Random}(\mathbb{R})$ be a D3161: Random real number such that
| (i) | \begin{equation} \exists \, a, b \in \mathbb{R} : \mathbb{P}(X \in [a, b]) = 1 \end{equation} |
Then
\begin{equation}
\text{Var} X
\leq \frac{(b - a)^2}{4}
\end{equation}