documentclass[letterpaper]{article}
usepackage{tikz}
usepackage{amsmath}
usetikzlibrary{arrows}
begin{document}

usetikzlibrary{arrows}
begin{tikzpicture}[x=1.25]

    begin{scope}[shift={(-50,0)}]

        draw[latex-latex] (0,0) -- (60,0);


        foreach x in  {10, 13, 15, 25, 50} {

            draw[
                shift={(x,0)},
            ] (0pt,3pt) -- (0pt,-3pt);
            draw[
                shift={(x,0)},
            ]
                (0pt,0pt) -- (0pt,-3pt)
                node[
                  below,
                  anchor=west,
                  rotate=-45,
                  font=scriptsize
                ] {$x$};
       }

       draw[
       *-,
       very thick,
       shift={(0,0.1)}
     ] (25, 0) -- (0, 25)
       node[
        above,
    anchor=west,
    font=scriptsize
      ] {Sample mean $bar{x}$};

    end{scope}
end{tikzpicture}
end{document}