Amazon·Product Manager·Onsite - Product Sense / Strategy·Intermediate

Intermediate

Apr 2026

Summary

Amazon PM interview with a market sizing question about weddings. Not much else to report.

Questions Asked (1)

Estimate how many weddings the average person attends over the course of their lifetime.

Product Analytics & MetricsAdaptability & Ambiguity

Author's notes

I blanked for a second and just started rattling off assumptions out loud.

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Suggested Approach

Break the problem into life stages (childhood, young adult, adult, senior) and estimate the number of weddings attended per year in each stage, then sum over an average lifespan. Use reasonable assumptions and round numbers to keep calculations simple, and state your assumptions clearly.

Pro tip: Anchor your estimate with a known data point, such as the average number of weddings a person attends per year as an adult, and adjust for life stages. This shows you can use benchmarks to drive estimates.

1. Define the scope and assumptions

Clarify that you're estimating for an average person in a developed country, assuming an 80-year lifespan and that weddings include friends' and family members' ceremonies.

2. Segment by life stages

Divide life into stages: childhood (0-18), young adult (18-30), adult (30-60), and senior (60-80). Estimate weddings attended per year in each stage based on social circles and typical life events.

3. Estimate weddings per year per stage

For each stage, estimate the number of weddings attended annually. For example, childhood: 1 every 2 years (0.5/year), young adult: 2/year, adult: 1/year, senior: 0.2/year.

4. Calculate total weddings per stage

Multiply the annual rate by the number of years in each stage. Childhood: 0.5*18=9, young adult: 2*12=24, adult: 1*30=30, senior: 0.2*20=4.

5. Sum and sanity-check

Add the totals: 9+24+30+4=67. Sanity-check by considering that the average person might attend 1-2 weddings per year as an adult, leading to a lifetime total of 50-100, so 67 is reasonable.

Key Points to Mention

Segmenting by life stages to account for varying social circles and wedding frequency.
Using benchmarks like average weddings per year for adults (e.g., 1-2) to anchor estimates.
Stating assumptions clearly (e.g., average lifespan, definition of 'average person').
Rounding numbers to simplify calculations and avoid false precision.
Sanity-checking the final estimate against known data (e.g., average number of weddings attended per year).
Acknowledging that the estimate is a rough approximation and could vary by culture and individual circumstances.

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.