Final answer:
The study allows the manufacturer to determine the average charging time for different car models, aiding in evaluating battery efficiency and effectiveness.
Step-by-step explanation:
The study conducted by the driverless car manufacturer assessing the quality of car batteries by measuring the time it takes to fully charge a car for a given model provides valuable information. By investigating five different cars in ten days, the manufacturer can deduce the average charging time for each car model. This data can help them evaluate the efficiency and effectiveness of the car batteries.