Estimation question
How would you estimate how many people are watching Youtube in India right now?
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What this question tests
Estimation using population and behavioral assumptions for a real time, geographically specific number.
How to approach it
- Anchor on India's internet using population, roughly 800 million people with regular internet access.
- Assume a fraction watch YouTube regularly, say 60 percent, giving roughly 480 million monthly YouTube users in India.
- Estimate the share active at a given moment, factoring in time of day, say 5 percent are watching right now.
- Multiply: 480 million times 5 percent gives roughly 24 million concurrent viewers.
- Adjust for time of day, since 'right now' should be treated as a typical peak evening hour.
- State the final estimate as a range, for example 15 to 25 million, given the uncertainty in each assumption.
What a strong answer includes
- States each assumption explicitly, internet population, YouTube penetration, and concurrent usage rate, rather than guessing a final number.
- Adjusts explicitly for time of day, since 'right now' materially changes the answer versus a daily average.
- Gives a range instead of a single overconfident number, reflecting genuine uncertainty.
- Uses round, defensible numbers instead of implausibly precise figures.
Common mistakes
- Not accounting for time of day, treating 'right now' the same as a daily average.
- Giving an oddly precise single number instead of a defensible range.
- Skipping the internet penetration assumption and just guessing total population usage.
Likely follow-up questions
- How would your estimate change for peak evening hours versus 3am?
- What real data source would you use to validate this?
- How would mobile data costs in India affect your assumption?
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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