Estimation question

Estimate the number of gas stations in SF city.

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What this question tests

Geographic estimation using area, density, and reasonable ratios.

Estimate San Francisco's population, roughly 850,000 people, and its land area, about 49 square miles, both commonly known reference figures.
Assume a typical gas station serves a local radius, roughly one station per 5,000 to 7,000 residents based on general urban density patterns.
Calculate using the population method: 850,000 divided by 6,000 gives roughly 140 gas stations.
Cross check with the area method: assume one station roughly every quarter to half mile in a dense city grid, giving a similar order of magnitude.
Adjust down slightly since San Francisco has unusually high transit use and low car ownership relative to a typical US city.
State the final estimate as a range, roughly 100 to 150 gas stations.

Uses two independent methods, population-based and area-based, and checks that they roughly agree, a strong estimation technique.
Adjusts for the city's specific context, lower car ownership, showing local reasoning rather than a generic formula.
States assumptions clearly and gives a final range, not a false-precision number.
Anchors on commonly known reference figures rather than inventing them.

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