\authorandnumber{Carlos Rodriguez}
\problemdate{Thu Sep 03 2009 11:02:40 GMT-0400 (Eastern Daylight Time)}
\textbook{Statistics by Freedman, Pisani and Purves}
\partname{0}
\chaptername{3}
\begin{problem}
\score{1}
Cut and paste the following code into R:


\begin{verbatim}
barplot(c(4,0,13,2),c(4,4,2,5),space=0,
  col="blue",
  main="Dividend Earnings in 1986", xlab="hundreds of dollars",
  ylab="Density % per 100$")
axis(1)
\end{verbatim}


The histogram of dividend earnings in 1986 for a sample of
180 persons is given in the figure produced by the code above.  
There are no persons in the
sample having dividend earnings in excess of \$1,500.  The block
over the interval from \$400 to \$800 is missing.  The height of
this missing block is closest to...


\begin{choice}
\gooditem{12}
\baditem{10}
\baditem{8}
\baditem{13}
\baditem{5}
\end{choice}


\begin{longanswer}
\begin{verbatim}
The heights are given in the DENSITY SCALE therefore the areas of the blocks come out in percent. Thus the areas of the blocks are: 16 + (?) + 26 + 10 = 100%.
Thus (?) + 52 = 100 producing (?) = 12%.
 
\end{verbatim}

\end{longanswer}
\end{problem}
