2. In a certain school, the number of students in the 7th, 8th, and 9th grades is the same. It is known that the number of boys in the 7th grade is the same as the number of girls in the 8th grade, and the boys in the 9th grade account for $\frac{3}{8}$ of the total number of boys in the school. Therefore, the proportion of girls in the entire school is

保留源文本的换行和格式，直接输出翻译结果。
2. $\frac{7}{15}$