Estimation question
Estimate the number of small businesses using Facebook ads.
- Meta
- Estimation
- Medium
Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.
Start a mock interview on this question · Mock interview from a job description
What this question tests
Whether the candidate can build a top-down estimate from total business counts and ad-adoption assumptions.
How to approach it
- State scope: assume active small businesses in the US using Facebook or Instagram ads, and confirm that with the interviewer.
- Estimate total small businesses in the US, roughly 33 million, as a stated assumption based on general small business counts.
- Estimate what share are active on social media for marketing, assuming roughly 50 to 60 percent maintain a business page.
- Estimate what share of those actually run paid ads rather than only organic posts, assuming roughly 20 to 25 percent.
- Multiply: 33 million times 55 percent times 22 percent gives roughly 4 million small businesses using Facebook ads.
What a strong answer includes
- Breaks the funnel into three clear stages, total businesses, social presence, paid ad adoption, rather than one guess.
- States each conversion percentage explicitly and explains why it's reasonable.
- Lands on a final range and flags it as an estimate rather than a precise count.
Common mistakes
- Skipping the funnel breakdown and guessing a single number directly.
- Not distinguishing organic page presence from actual paid ad usage.
Likely follow-up questions
- How would this estimate change during a holiday shopping season?
- What data source would give you the most confidence in this number?
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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