$($a$)$ A financial analyst would like to study the stock market in Hong Kong. It is believed that the stock market will become overvalue when one of the indicato Time left $1$ :

price$/$earning $(\frac{P}{E}$ ratio is over $33\mathrm{.}9.$ On this basis, he finds out $30$ companies and records their $\frac{P}{E}$ ratio as below:

Round the data down to an integer $($e$.$g$.,29\mathrm{.}7$ will be $29)$ and then prepare a stem$-$and$-$leaf display for the rounded data.

$[$Do not put space between digits $($e$.$g$.,$ put $1123$ instead of $1123).]$