Stem and Leaf plots are easy to build. All of thse values are in 10 units.
Put the 10's digit on the left of the verical bar and the 1's digit on the right.
i.e. There are 3 17's that occur. So, they would be written as 1|777
and so on. Since numbers like 5 and 7 are 1's digits, they have 0 to the left of the vertical line.
Here is the chart and the summary stats to help see what is going on:
\(\displaystyle \begin{array}{c|ccccccc}0&5&7&7&9\\1&3&6&7&7&7&8\\2&1&2&2&4\\3&0&1&2&5&8\\4&1\end{array}\)
\(\displaystyle \text{Sample Size= 21}\)
\(\displaystyle \text{Mean= 20.85714286}\)
\(\displaystyle \text{Median= 18}\)
\(\displaystyle \text{Std. Deviation= 10.39367962}\)
\(\displaystyle \text{Minimum =5}\)
\(\displaystyle \text{Maximum= 41}\)
These can be done with Excel along with the summary stats. That is how I done it.
