Instruction 2 Note: 1L Means the 'Low Teens' - 10, 11, 12

Instruction 2.5
The Stem-and-Leaf display below contains data on the number of months between the date a civil suit is filed and when the case is actually adjudicated for 50 cases heard in the Supreme Court of Victoria.
$$\begin{array} { | l | l | } \hline \text { Stem } & \text { Leaves } \\\hline 1 \mathrm {~L} & 23444 \\\hline 1 \mathrm { H } & 7899 \\\hline 2 \mathrm {~L} & 2222345 \\& 5 \\\hline 2 \mathrm { H } & 678889 \\\hline 3 \mathrm {~L} & 001113 \\\hline 3 \mathrm { H } & 5778 \\\hline 4 \mathrm {~L} & 0234 \\\hline 4 \mathrm { H } & 5579 \\\hline 5 \mathrm {~L} & 1124 \\\hline 5 \mathrm { H } & 66 \\\hline 6 \mathrm {~L} & 15 \\\hline 6 \mathrm { H } & 8 \\\hline\end{array}$$ Note: 1L means the 'low teens' - 10, 11, 12, 13, or 14; 1H means the 'high teens' - 15, 16, 17, 18, or 19; 2L means the 'low twenties' - 20, 21, 22, 23, or 24, etc.
-Referring to Instruction 2.5,if a frequency distribution with equal-sized classes was made from this data,and the first class was '10 but less than 20',the relative frequency of the third class would be _________.