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Data analyst Interview Questions

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How many barbers were there in Ireland?

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Its a basic Fermi problem.

There are 4.83 million people in Ireland I would assume that 50% of them are males I would assume that an average male goes to the barber once every month I would assume that each barber can deliver services to 3 people per hour I would assume that each barber works an average of 30*4*11 hours I would assume that an average barber has an occupancy ratio of 70% 4830000*0.5*1 barber services demand per month in Ireland (males) 30*4*3*0.7 barber services per barber and month There are around 9.000 barbers in Ireland

Why do you want to work here?

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SoftDev : Python (I chose), you have an array of string sorted but with empty strings (e.g. ["abc","","","","cef","","","dej,""] and you want to know if an other string is in this array. How to do it with a complexity of O(log n) in general case ? Then how to find how many times it appears in this array ?

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Competency-based Questions

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Rate in order of importance 30 items astronauts had to get from dark side of moon back to rocket

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Technical challenge round: binary classification

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What can you tell me about the FD client base?

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Data science : Explain Markov Chains to a 8 years old chilf

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Data science : What is a good/bad Data visualisation ?

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Data science : I had a graph showing different step were a client is interested by microsoft product to the real buying act. If you have a dataset of previous clients who bought/didn't buy, how to make prediction for new clients ?

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