Add the numbers on the "Senior" column to find the total amount of senior students:
[tex]2+3=5[/tex]
Add all the numbers on the table to find the total amount of students:
[tex]4+3+6+4+2+6+2+3=30[/tex]
Divide the total number of Senior students over the total amount of students to find the probability the student is a senior if a student is selected at random. Multiply the result by 100% to write it as a percent:
[tex]\frac{5}{30}\times100\text{ \%=}\frac{1}{6}\times100\text{ \%}=16.666\ldots\text{ \%}[/tex]
To the nearest whole percent, the probability is:
[tex]17\text{ \%}[/tex]
