Debian Minimal

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}


\usepackage{color}
\usepackage[T1]{fontenc}

\DeclareMathOperator{\argh}{argh}
\DeclareMathOperator*{\nut}{Nut}

\pagestyle{empty}



\begin{document}

\begin{huge}

\[\mu = \sum_{i=0}^{N} \frac{x_i}{N}\]

\end{huge}

\end{document}