Google Estimation Interview Questions

Chelsea F. - "Questions: Clarify: High school = grades 9-12? So roughly ages 15-18 (4 years)? Are we talking about all high-school aged kids, or kids who actually attend HS? Do we count home schoolers? Drop outs? Assumptions: Let's assume we're estimating the number of children in the U.S. who are enrolled in/attend HS Assuming a uniform distribution of the population across ages Approach: U.S. Population = 300m Average lifespan = 80 years 4 years represented by HS age = 5% of the populati"See full answer

Anonymous Muskox - "Clarification Questions I am assuming we need to deliver the packages to the doorstep. I am assuming we need to deliver all the packages which are ordered in a single day. For more product interview experience, please visit TechnoManagers https://technomanagers101.blogspot.com/ High level formula Number of Drones required = (US Population 330M)(Excluding 30% those below 10 years and above 65 years)(internet penetration 90%)([ (10% high networth people)(30 orders per year) ] + ["See full answer

Anonymous Tiger - "Clarify question and state assumptions: Streetview from my understanding is compiled by a streetview car going out and taking multiple photos and then Google stitches this together to give us streetview. I'm only going to look at the streetview outdoor experience, I know for e.g Google also has full views of some businesses, malls, museums etc so for the purposes of this I'm not going to calculate this. For the purposes of this is it OK if we say how much storage required to store streetview"See full answer

Anubhav A. - "Lets see, what kind of cost does google have to incur to run google photos. To think about this clearly, I want to think as if I was going to setup Google Photos now and it doesn't exist till today. Cost for Building software and maintaining it Cost for acquiring users Cost for keeping the data of users safe and accessible Miscellaneous Now lets come back to today where Google photos clearly exist and I will think about the costing in each of these sections. Google photos s"See full answer

Cameron P. - "Clarifying Questions: US or globally? globally Consumer or business use? consumer Assumptions: Assuming we are interested in frequent users, let's say someone who uses Google Drive at least 5 times a year. Discluding anyone who has used Google Drive less than 4 times per year. Assuming Google Drive is a place to store, share, and collaborate on files and folders from your mobile device, tablet, or computer. Recap: We would like to estimate the number of users of Google Drive"See full answer

Harsh S. - "Some clarifying questions. Does this include storage required for backup? Assume - Yes and only one replica. Will email be compressed? Assume - Yes Assuming world wide user base. Let's formulate the equation required to estimate this answer. total storage required = (Total users x storage growth/per user + new users x storage required/user - all users x delete storage)*compression ratio + storage required for one replica. Total Gmail users = ~1B Based on my own ema"See full answer

Andrea L. - "Clarification Questions: Through in-person purchases or including online? Both Cinema just for movies? Yes Amount of revenue or just tickets sold? Tickets sold High Level Equation: Cinema tickets in a year = (# of cinemas in the US) * (# of movie playings per cinema per year) * (# of viewers per cinema per screening) \# of Cinemas in the US = amount of states * average number of cinemas per state High Density Areas - 30% - 50 cinemas = 50 x 50 x .3 = 750 Suburban T"See full answer

James M. - "Break down into: OPEX #Employees x $avg. cost per employee $Overhead (mktg, legal, compliance) Content cost (creator payments) 80% of advert. revenue Elec, cooling, maintenance CAPEX #Data centers Avg servers per data center Avg. cost $ per server"See full answer

Anonymous Moose - "Assumption US, not global. Two categories of masks: washable/reusable (cloth based) and disposable (surgical and N95) US population is about 300 million 100M households 3 per households** Cloth: on average 2 masks needed per person so they can wash it (2*3=6 masks per HH) 100M*6 = 600M cloth masks Disposable: of the 300M, assuming about 60% is essential workers. So about 300M*.6=180M are essential workers. Of the 180M, I would say abo"See full answer

Anonymous Parakeet - "Clarifying questions: Does the home have to be fully paid off to consider the millenial a homeowner? No, they just need to have the title or put a loan on it We are only considering the continental US? Yes, not territories Just four wall stationary homes, not empty land, nor RV/trailer homes? Exactly Basic Facts: 70 million millennials 300 million US population Millennials have low rates of homeownership 130 million houses in the US Millennials span == 18 to 36 Breakdown: "See full answer

Jax H. - "Let’s pick SFO (because it's a stupid choice.. probably easier if you pick a smaller airport) We know each passenger has to go through the scan at least once We can assume 10% of passengers go through twice People only go through scans when they depart but not when they arrive International planes are bigger so carry more people so need to calculate separately Approach Estimate how many gates there are Estimate airport operation hours Estimate the numbe"See full answer

Rev - "Narrow down on a person (born in city childhood - school - college - work - retirement) Age: 0-5 = ignoring travel for this part (might travel with parents) 5-19 = weekdays school, weekends outings School distance 5 km , total = 10km (to & fro) (4 intersections * 1min(time spent) = 4 min/ day) 52 x 5 x 4 = 1040 mins ~ 15 hrs 15 * 14 yrs = 210 hrs Weekends 52 x 2 = 104 days * 0.3 = 30 days Trips = 10 km (8 intersections * 1min(time spent) = 8 mins) 30 x 8 ="See full answer

K N. - "Assumptions Contact lens camera is launched only in the US Ages most likely to benefit 20-60 Doesn't work with prescription i.e. people who have prescription glasses/contact lens are not the target market Can't be worn all the time max of 10 hours. Capturing video via contact lens means people have to stare at things uninterrupted. Assuming, no that video stops the moment people close their eyelids video length will be limited to maximum staring"See full answer

Darpan D. - "Clarifying and Assumptions When we say New York City, does this mean just Downtown New York or also the suburbs? Assumption: It means Downtown New York only. Is the bike-sharing service like Uber, where people share their own bikes, or is it a service run by a company with bike stands on street corners? Assumption: It’s run by a private company with bike stands on street corners. Will the bike-sharing service start as free, or will we charge people from the beginning?"See full answer

Lucy Y. - "I'm a bit confused - The $40B hrs is the total time spent commuting to work, correct? Whereas the question asks "hours lost ... in traffic". Is the answer not correct then?"See full answer

Yasin E. - "25 min"See full answer

Sushma R. - "open a social media challenge to share their street view. It will cost 0"See full answer

Sangeeta P. - "Since I am residing in Bangalore, I will consider the Bengaluru airport. The airport has 2 terminals. I am going to consider the security scan done at both the terminals for the estimation. Does it include security scans for both international and domestic flights? --> Both The airport crew members and pilots also go through the security scan. So, should I include only them as well or only the passengers in my calculation? --> Only the passengers Number of people going through the security scan"See full answer

Chelsea F. - "Questions: Are these bikes for personal or commercial use? Or both? For commuting, or should we also include recreational bikes (e.g. mountain bikes?) Should we include stationary exercise bikes, or only those used outside? E-bikes and motorcycles? Are we counting children, or just adults? Should we factor in whether the individual has purchasing power to purchase a new bike? What about renting a bike? Assumptions: Assuming we are sizing the market for personal commuter bicycles f"See full answer