Estimation question
How much does a school bus weigh?
- Estimation
- Easy
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What this question tests
Physical estimation skills using known reference points and basic component reasoning.
How to approach it
- Break the bus into major components: chassis and body frame, engine, seats, and wheels.
- Reference a known comparison: a typical car weighs roughly 1.5 tons, and a school bus is much larger and built with heavier steel framing.
- Estimate the empty (curb) weight based on size, roughly 7 to 8 times a car's mass given the extended steel frame and larger engine, landing near 10 to 12 tons.
- Cross check against a known reference: full-size buses are commonly cited as weighing around 10 to 12 tons empty (common knowledge approximate range).
- Adjust for passenger capacity if asked for loaded weight, adding roughly 2 to 3 tons for a full 40 to 70 seat load.
- State a final empty weight estimate, roughly 10 to 12 tons, noting the assumption clearly.
What a strong answer includes
- Anchors the estimate to a known reference point, a car's weight, and scales up logically rather than guessing blindly.
- States the final range clearly, around 10 to 12 tons empty (assumption), with the reasoning shown.
- Distinguishes curb weight from loaded weight if the question is ambiguous, showing precision.
Common mistakes
- Giving a wildly small guess, like under 1 ton, with no reference point used.
- No distinction between empty and loaded weight.
- No shown reasoning, just stating a number.
Likely follow-up questions
- How would your estimate change for an electric school bus?
- What would you check to validate this estimate quickly?
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 2: Data fluency: SQL, logs, and reading the truth yourself
- Chapter 9: Prove it paid off: outcomes, economics, and pricing
- Chapter 14: Get the job: the AI PM interview loop