medium · Enhanced ACT science
A study on car fuel efficiency (mpg) collected data at different speeds. The results are in the table:
| Speed (mph) | Efficiency (mpg) |
| :--- | :--- |
| 30 | 28 |
| 45 | 34 |
| 60 | 31 |
| 75 | 24 |
What is the most likely efficiency for a car traveling at 50mph, and what logic supports this prediction?
- Exactly 35mpg, because efficiency increases with speed according to the first two data points.
- Approximately 33mpg, using interpolation between the 45mph and 60mph data points.
- Exactly 31mpg, because 50mph is closer to 45mph than it is to the 60mph measurement.
- Less than 24mpg, based on extrapolating the sharp decline seen between 60 and 75mph.
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