Below are the scores of group of students in a music test
$\begin{array}{c|c}scores & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\ \hline \text{No, of students} & 3 & 6 & 10 & 8 & 6 & 5 & 2 & 4 & 12\end{array}$
If CF(x) is the number of students with scores less than or equal to x, find CF(6)

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