Question

at a school, eleventh - graders and twelfth - graders were asked how they get to school. the results are shown in the table.
what is the probability that a student who walks to school is an eleventh - grader?

Explanation:

Step1: Calculate the number of students who walk

Add the number of eleventh - graders who walk and twelfth - graders who walk.
$25 + 20=45$

Step2: Calculate the probability

The probability \(P\) that a student who walks is an eleventh - grader is the number of eleventh - graders who walk divided by the total number of students who walk.
$P=\frac{25}{45}=\frac{5}{9}$

Answer:

$\frac{5}{9}$