Walk me through how you would estimate the number of haircuts given in a city of 1 million people during a typical week. Explain your framework, the logical steps you take, and the key assumptions you make. — Estimation Interview Question

Start with the total population and segment it into logical groups (e.g., by gender or age), as different demographics get haircuts at different frequencies.

This hint points you toward a useful angle without giving away the approach

Estimate the frequency of haircuts for each segment (e.g., once every 4 weeks) to find the weekly volume. Don't forget to state your assumptions clearly and do a quick sanity check at the end.

This hint names a specific framework or structure to use