\begin{Schunk}
\begin{Sinput}
 sigma
\end{Sinput}
\begin{Soutput}
[1] 15
\end{Soutput}
\begin{Sinput}
 sd(x)
\end{Sinput}
\begin{Soutput}
[1] 15.39491
\end{Soutput}
\end{Schunk}
