The stem plot below displays the average number of decayed teeth in 12-year-old children from `31` countries.
| \begin{array} {r|lll} \textbf{Stem} & \textbf{Leaf} \\ \hline 0 & 2 \\ 0 & 5\ 6\ 7\ 7 \ 8\ 9\ \\ 1 & 0\ 0\ 0\ 0\ 1\ 4\ 4\ 4\\ 1 & 5\ 6\ 7 \\ 2 & 3\ 3\ 4 \\ 2 & 7\ 7\ 8\ 8 \\ 3 & 0\ 4 \\ 3 & 5\ 6 \\ 4 & 1 \\ 4 & 7 \\ \end{array} |
\(\text{key: }0|2=0.2\) |
Based on this stem plot, the distribution of the average number of decayed teeth for these countries is best described as
- positively skewed with a median of 15 decayed teeth and a range of 45
- approximately symmetric with a median of 1.5 decayed teeth and a range of 4.5
- negatively skewed with a median of 1.5 decayed teeth and a range of 4.5
- positively skewed with a median of 1.5 decayed teeth and a range of 4.5