Estimation Interview Questions

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

Sai ganapathy S. - "Estimate the number of Slack Users. Are we going to calculate the number of Slack users only in the US or throughout the world ? Slack users within the US By Slack users, are we going to consider only personal account users or enterprise account owners as well ? Both. Enterprise and Personal Account. Assuming that there are around 330 Million individuals in the US, splitting them into various age groups. 0-20, 2-40, 40-60 - 80 Million each Above 80 = 80 Million Since"See full answer

Veronica S. - " CQ: 1. Understanding of Google search and the way ads are being displayed today. What kind of subscription model are we thinking of: same as youtube I talked about Google search as a flagship product of google. % of revenue generated from ads. Other search engines and there % share in the market. Other players such as Facebook whose 99% revenue is from ads. Talked about Google Mission and alignment of the ads with Google mission Pro Con list of subscription versus ads User exp. 2."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

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

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

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

Panchali C. - "Questions I would ask the interviewer Are we considering only single owners or jointly homeowners? Do we consider people who are only buying, or do we consider gifted or inherited properties from parents or families? Fully paid or partially paid. To first explain my approach, I would consider the following assumptions: Total Population of the United States: 330 mn Millennials is considered between the age group of 19 to 35 years of age Population who are in the medium income gr"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

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

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

Alex C. - "I would have been destroyed on this."See full answer

Indranil G. - "It is NYC so mainly a business area. Also, there will be travelers to visit. Now we estimate that 5% of them are business travelers and 3 % of them are tourist So 8000000*5% = 400000 is Business And 7600000*3% = 228000 is tourist Now we also need to consider there are a family tourist who will use the same room that let us estimate 40% of the tourists are family means 40% * 7988000M = 91200 family and 1368000 is solo travelers 45600 are family room required considering there are 2 fa"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

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

Sai ganapathy S. - "Estimation - Estimate Lyft revenue Modes of Income Revenue through Ads Revenue earned from drivers and ride bookings Premium Subscriptions (Lyft Pink) and Other + subscriptions. Considering US as Lyft's primary market and hence estimating revenue for this market for Lyft Total Population of US : 330 Million Among this 330M, there are Low income families - Families who earn just to make their ends meet. So they won’t be able to afford cabs since it is a bit expensive. Assuming"See full answer

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

Yasin E. - "25 min"See full answer