14, 18, 19, 19, 20, 21, 23, 28, 29, 33

First, it must be determined what the stems will represent and what the leaves
will represent. Generally, the leaf contains the last digit of the number and
the stem contains all of the other digits. In this example, the leaf represents
the ones place and the stem will represent the tens place. It is important to
note that when there is a repeated number in the data (such as two 19s) then the plot
must reflect this fact.

With this applet, you can generate random data and create stem and leaf plot.