% Source: http://www.tug.org/texlive//Contents/live/texmf-dist/doc/latex/bchart/bchart.pdf
\documentclass[varwidth=true, border=2pt]{standalone}

\usepackage{bchart}

\begin{document}
    \begin{bchart}[step=2,max=10]
        \bcbar{3.4}
            \smallskip
        \bcbar{5.6}
            \medskip
        \bcbar{7.2}
            \bigskip
        \bcbar{9.9}
    \end{bchart}
\end{document}