495 students in 7th grade do not ride a car to school
Step-by-step explanation:
- Step 1: Find the percentage of number of students in 7th grade who ride in a car to school in the sample.
Number of students walking or riding a bike = 8
Number of students who ride a car = 15
Number of students who take the bus = 25
Total students in the sample = 48
⇒ Percentage of students who rides a car in the sample = 15/48 × 100 = 31.25%
- Step 2: Find the equivalent number of students who ride a car in the total number of students.
Total number of students = 720
Number of students who ride a car = 31.25/100 × 720
                              = 225
- Step 3: Find the number of students who do not ride a car to school.
Number of students who do not ride a car to school = 720 - 225 = 495
