PEOPLE PER VEHICLE AT CHECKPOINT
| Number of People in Vehicle | Percent of Vehicles |
| 1 | 40% |
| 2 | 35% |
| 3 | 15% |
| 4 | 7% |
| 5 or more | 3% |
A researcher recorded the number of people in each vehicle that passed through a checkpoint. The table above shows the percent distribution for the 420 vehicles that passed through the checkpoint yesterday morning. How many of the 420 vehicles contained at least 3 people?
- A42
- B63
- C105
- D315
Show the answer
Correct answer: C
First, add the percentage of cars containing 3 people, 4 people, and 5 or more people:
15% + 7% + 3% = 25%
Thus, 25% of the cars contained at least 3 people, so use that to calculate the number of cars:
420 × 0.25 = 105 cars.