EasyMarket Making & Games
Piano Tuners in Chicago
OptiverIMC Trading
Estimate: how many piano tuners work in Chicago? There is no “right” number — the interviewer is grading the structure of your estimate, the reasonableness of each input, and whether the final answer is the right order of magnitude.
Approach
Population → households → pianos → tunings per year → tunings per tuner.
Related problems
Make a Market on Two DiceEasyFair Value of a Loaded DieMediumOdds to ProbabilityEasyTwo-Thirds of the AverageMediumTriangular FX ArbitrageEasySkewing Off an InventoryEasy
More in Market Making & Games.