Interview Question

Product Manager InterviewNew York, NY

Google

Choose a city and estimate how many Piano Tuners operate a business there.

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Interview Answers

8 Answers

9

Chernobyl - Zero

Soheil on
4

Let's choose a city, say Los Angeles. Let's start with the population of Los Angeles. I know that New York has a population of 5M. I'm going to assume that Los Angeles is roughly the same (although its probably smaller). Let's go with 5M inhabitants. 5 * 10^6 inhabitants. Now lets start making some assumptions. 1) I know that roughly 3 people occupy each home. So we can assume that in LA there are roughly 5/3 * 10^6 homes. 2) Not all homes will have a piano. Lets assume that 10% of homes will have a piano. This will result in 5/3 * 10^5 pianos. 3) Now a piano tuner can probably tune 1 piano a day. I don't know what tuning is but maybe that's reasonable? That means, a single piano tuner will be able to tune 300 pianos a year 4) Now, how many tunings does a piano need per year. Once again 1 sounds reasonable. lets put it all together. To guesttimate the number of piano tuners, all we need is # of tuning opportunities per year / # of tunings per tuner per year. = 5/3 * 10^5 / 300 = 5/9 * 10^3 = 550 piano tuners that can be gainfully employed. This number seems reasonable :)

Sparthan on
1

Oh no - are they still asking the piano tuners question! :-( Arghhh..

Anonymous on
1

This is a Fermi problem- search for fermi problems for answers

Anonymous on
0

Made some assumptions, seems with these its best to make an assumption rather than ask a question and check with them that the assumption is ok

Anonymous on
0

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Alex on
0

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Anonymous on
0

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Anonymous on

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