\documentclass[a5paper]{article}
\usepackage[margin=5mm]{geometry}
\usepackage{commalists-tools-l3}
\begin{document}
\def\mytestlist{14,10,15,11,9,10}
We consider the list: \mytestlist\par\smallskip
There's \ctlenoflist*{\mytestlist} values in the list\par\smallskip
The minimum value is \ctminoflist*{\mytestlist} and the maximum is \ctmaxoflist*{14,10,15,11,9,10}\par\smallskip
Ascending sorted list is \ctsortasclist*{\mytestlist}\par\smallskip
Mean value of the list is \ctmeanoflist*{\mytestlist}\par\smallskip
If we remove the value 10, then the list is \ctremovevalinlist*{10}{\mytestlist}\par\smallskip
We test if 15 is in the list: \cttestifvalinlist{15}{\mytestlist}{true}{false}\par\smallskip
The third value of the list is \ctgetvaluefromlist*{\mytestlist}{3}\par\smallskip
15 is in index \ctgetindexfromlist*{15}{\mytestlist} in the list\par\smallskip
Sublist [-,4] of the list is: \ctsublist*{\mytestlist}{*}{4}
\end{document}