Create 2D Numberlines in Latex

Question

I want to create one and two dimensional, normalized numberlines as you can see in this picture:

I tried it with tikz, but there are so many things that I'm new to. How to make the <- empty, ... ->, how to create mathematical expressions in the four fields, ...

Answer 1

One of the reasons why users are not too excited about such questions is that they force the ones who may answer to type in text from a screen shot. This prevents many from answering. Therefore, in the future, always post what you have tried, at the very least this will allow others to just copy these texts. This answer defines a style with which drawing the number line becomes as simple as saying

\draw[ultra thick,numberline={items={occupied/0.4,don't know/0.6}}] (0,3) -- (5,3);

It has several styles and keys that allow you to customize the appearance in many ways.

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{decorations.pathreplacing,calc,patterns}
\begin{document}
\begin{tikzpicture}[scale=1.2,numberline/.style={/utils/exec=\tikzset{numberline/.cd,#1},postaction={decorate,
 decoration={show path construction,
      lineto code={
       \draw (\tikzinputsegmentfirst) -- (\tikzinputsegmentlast); 
       \edef\mylist{\pgfkeysvalueof{/tikz/numberline/items}}
       \pgfmathsetmacro{\mysum}{0}
       \foreach \XX/\YY in \mylist
       {\pgfmathsetmacro{\mysum}{\mysum+\YY}
       \xdef\mysum{\mysum}}
       \draw[/tikz/numberline/tick]   (\tikzinputsegmentfirst)    
        -- ($(\tikzinputsegmentfirst)!\pgfkeysvalueof{/tikz/numberline/tick length}!-90:(\tikzinputsegmentlast)$) 
        coordinate[pos=0.5] (numberline-0) 
        let \p1=($($(\tikzinputsegmentfirst)!\pgfkeysvalueof{/tikz/numberline/tick
        length}!-90:(\tikzinputsegmentlast)$)-(\tikzinputsegmentfirst)$),\n1={atan2(\y1,\x1)-180} in 
        node[anchor=\n1]{$0$};
       \pgfmathsetmacro{\sumsofar}{0}
       \foreach \XX/\YY [count=\ZZ] in \mylist
       {\pgfmathsetmacro{\sumsofar}{\sumsofar+\YY}
       \xdef\sumsofar{\sumsofar}
       \pgfmathsetmacro{\fraction}{\sumsofar/\mysum}
       \draw[/tikz/numberline/tick] ($(\tikzinputsegmentfirst)!\fraction!(\tikzinputsegmentlast)$) -- 
        ($(\tikzinputsegmentfirst)!\fraction!(\tikzinputsegmentlast)!\pgfkeysvalueof{/tikz/numberline/tick length}!90:(\tikzinputsegmentfirst)$)
        coordinate[pos=0.5] (numberline-\ZZ) 
        let \p1=($($(\tikzinputsegmentfirst)!\pgfkeysvalueof{/tikz/numberline/tick
        length}!-90:(\tikzinputsegmentlast)$)-(\tikzinputsegmentfirst)$),\n1={atan2(\y1,\x1)-180} in
        node[anchor=\n1]{$\pgfmathprintnumber{\fraction}$};
       \draw[/tikz/numberline/arrow] (numberline-\the\numexpr\ZZ-1) -- (numberline-\the\numexpr\ZZ) node[/tikz/numberline/node]{\XX};
       }
      }}}},numberline/.cd,tick/.style={ultra thin},arrow/.style={latex-latex,thin},node/.style={allow upside down=true,auto,swap,sloped,midway,font=\small\sffamily},items/.initial={A/1,B/1},
      tick length/.initial=7pt]
 \draw[ultra thick,numberline={items={occupied/0.4,don't know/0.6}}] (0,3) -- (5,3);
 \draw[ultra thick,numberline={items={occupied/0.6,don't know/0.4}}] (0,0) -- (5,0);
 \begin{scope}[xshift=7cm,pft/.style={align=center,font=\sffamily\small,inner sep=0.5pt,outer sep=0pt}]
  \draw[thin,pattern=dots] (0,0) rectangle (3,2) node[midway,pft]{Occupied $\Omega$\\ $=$occupied} 
    (0,2) rectangle (3,5) node[midway,pft]{Occupied $\Omega$\\ $=$duck}  (3,0) rectangle (5,2) node[midway,pft]{Don't know $\Omega$\\ $=$koala} ;
  \draw[thin,pattern=crosshatch dots]  (3,2) rectangle (5,5) node[midway,pft,fill=white]{Don't know $\Omega$\\ $=$squirrel} ;
  \draw[ultra thick,numberline={items={occupied/0.6,don't know/0.4}}] (0,0) -- (5,0);
  \draw[ultra thick,numberline={items={occupied/0.4,don't know/0.6},tick length=-7pt,node/.append style={above}}] (0,0) -- (0,5);
 \end{scope}
\end{tikzpicture}
\end{document}