Let's complete the frequency table based on the given data set:
```
\begin{tabular}{|c|c|c|c|c|}
\hline Interval & [tex]$20-28$[/tex] & [tex]$28-36$[/tex] & [tex]$36-44$[/tex] & [tex]$44-52$[/tex] \\
\hline Frequency & 14 & 5 & 9 & 2 \\
\hline
\end{tabular}
```
So for the interval [tex]$20-28$[/tex], there are 14 data points; for [tex]$28-36$[/tex], there are 5 data points; for [tex]$36-44$[/tex], there are 9 data points; and for [tex]$44-52$[/tex], there are 2 data points.