Estimation question

How many police stations are there in the US?

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Basic structured estimation: deriving a national facility count from population and jurisdiction size assumptions.

Clarify whether to count only municipal police stations or include county sheriff and state police offices.
Estimate the US population, roughly 330 million.
Estimate an average population served per police station, for example 10,000 to 20,000 people.
Divide population by that figure to get an estimated station count.
Sanity check against the number of US cities and counties, since most jurisdictions have at least one station.

States the population per station assumption clearly and explains why it varies between dense cities and rural counties.
Lands on a range, for example 15,000 to 20,000 stations, rather than one falsely precise figure.
Cross checks the number against roughly 3,000 US counties and thousands of incorporated cities, each likely to have at least one station.

Ignoring rural versus urban density differences and using one flat ratio nationwide.
Not cross checking against a second method, like counting by county.

Chapters of the AI PM course that teach what this question tests.