Danke schon mal.
\documentclass{article} \usepackage{tikz,pgfplots} \pgfplotsset{compat=1.14} % Gauss function, parameters mu and sigma % #1 is \mu; #2 is \sigma \pgfmathdeclarefunction{gaussian}{2}{ %exp(\frac{(x-\mu)^2}{2*\sigma^2}) \pgfmathparse{1/(#2*sqrt(2*pi))*exp(-((x-#1)^2)/(2*#2^2))}} %\sigma*\sqrt{2*pi} \begin{document} \begin{center} \begin{tikzpicture} \begin{axis}[no markers, domain=97.8:102.2, samples=250, axis lines=left, xlabel=$x$, ylabel=$f_{X}(x)$, every axis y label/.style={at=(current axis.above origin),anchor=south}, every axis x label/.style={at=(current axis.right of origin),anchor=west}, height=6cm, width=12cm, ymin=0, ymax=1.5, ticks=none, %Ausblenden der Achsenskalierung, auskommentieren falls Skalen erwünscht ytick={0.25,0.50,0.75,0.90,1}, xtick={97,97.5,98,98.5,99,99.5,100,100.5,101,101.5,102,102.5,103,103.5}, enlargelimits=false, clip=false, axis on top] \addplot [very thick,cyan!50!black] {gaussian(100,0.8}; % #1 is \mu; #2 is \sigma^2 \addplot [very thick,cyan!50!black] {gaussian(100,0.5)}; \addplot [very thick,cyan!50!black] {gaussian(100,0.3)}; %\draw (axis cs: 100,-.1) node [fill=none] {$\mu$}; \draw [<-](axis cs: 100.30,1.1) -- (axis cs: 100.60,1.4) node [fill=white] {$\sigma_1$}; \draw [<-](axis cs: 100.65,0.5) -- (axis cs: 101.05,0.9) node [fill=white] {$\sigma_2$}; \draw [<-](axis cs: 101.25,0.2) -- (axis cs: 101.65,0.6) node [fill=white] {$\sigma_3$}; \draw (axis cs: 101.5,1.45) node [fill=none] {$\sigma_1<\,\sigma_2<\,\sigma_3$}; \draw [dotted](axis cs: 100,0) -- (axis cs: 100,1.3); \end{axis} \end{tikzpicture} \end{center} \end{document}