documentclass{report}

usepackage{pgfplots} % for histograms

begin{document}

begin{tikzpicture}
    begin{axis}[ height = 0.4paperheight
                , width = 0.7paperwidth
                ]

        addplot [ybar interval, color = black, fill = blue, line width = 0.5mm]
            table {hist1.data};
    end{axis}
end{tikzpicture}

end{document}

1 0.06
 3 0.23
 5 0.35
 7 0.2
 9 0.1
 11 0.04
 13 0.01
 15 0
 17 0
 19 0.01
 21 0

documentclass{report}

usepackage{pgfplots} % for histograms
usepackage{filecontents}
begin{filecontents*}{hist1.data}
 1 0.06
 3 0.23
 5 0.35
 7 0.2
 9 0.1
 11 0.04
 13 0.01
 15 0
 17 0
 19 0.01
 21 0
end{filecontents*}
begin{document}

begin{tikzpicture}
begin{axis}[
  height = 0.4paperheight,
  width = 0.7paperwidth,
  ytick=data,xtick=data
 ]

  addplot [ybar interval, color = black, fill = blue, line width = 0.5mm]
            table {hist1.data};
end{axis}
end{tikzpicture}

end{document}