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For a collection of ordered events
\(x_1 \lt x_2 \lt ... \lt x_s\)
with corresponding frequencies
\(f_1, f_2, ..., f_s\text{,}\)
the cumulative relative frequency is the function
\begin{equation*} F(x) = \sum_{x_k \le x} f_{x_k} \end{equation*}
in-context