How many piano tuners are there in Chicago, USA?

Come up with a series of estimates that will lead to a sensible answer.

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Wikipedia,

Wednesday, August 29, 2018

"Fermi problems are named after Italian-American physicist Enrico Fermi as he was known for his ability to make good approximate calculations with little or no actual data. An example is his estimate of the strength of the atomic bomb that detonated at the Trinity test, based on the distance traveled by pieces of paper he dropped from his hand during the blast. Fermi's estimate was remarkably close to the now-accepted value. A famous example of a Fermi-problem-like estimate is the Drake equation, which seeks to estimate the number of intelligent civilizations in the galaxy. The basic question of why, if there were a significant number of such civilizations, ours has never encountered any others is called the Fermi paradox."

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