3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
290,000
vehicles
How to estimate it
Fermi’s official “Napkin math”
Iceland is famously tiny, only about 380,000 people. Most adults there own a car, so take away the kids and you're left with maybe three-quarters of them.
- Iceland population
- 380,000
- Own a vehicle
- ~0.75
- 380k × 0.75
- ≈ 290,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Iceland population
- ≈ 390,000
- Vehicles per capita
- × 0.74
- 390,000 × 0.74
- ≈ 290,000
Reference cited by Fermi: Icelandic Transport Authority (Samgöngustofa)
How close was your guess?
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Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.