Product Manager Estimation Interview Questions

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

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

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

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

Fabio E. - "First I would like to ask you some clarifying questions. Timeframe: do we consider a single given day? YES What is the definition of jogger? Running, not walking Is there a minimum distance? NO Do you count only the distance within the perimeter of central park or also the miles getting in and out of CP to my start location? ONLY CP Great, I would like to structure the problem this way. \# of aggregated miles run by jogger in a day in CP = # of joggers per day * av"See full answer

Nehal B. - "Who uses translation API Consumer apps Enterprise SaaS Content Platforms Gaming Companies Govt Global internet users - 5B out of which 20% need translation as they encounter foreign content = 1B users Average translation triggering event per use per day - 0.3 (review, website…) Total translation demand = 0.3 * 1B = 300M Translation can happen in-house or via Third-party APIs Assume 60% served by APIs for enterprise 180M API translation calls/day Assume 1000 characters should be abo"See full answer

Reshma R. - "Solution: World population = 8B Assuming 10% of world population does not use detergent( using only soap or using only water) Remaining population = 90/100 * 8B = 7.2B ~ 7B Diving the users into 3 categories Users who wash everyday Users who wash twice a week Users who wash once a week Wash everyday --- Wash twice a week --- Wash once a week Used clothes < Used clothes < Used clothes 5gm --- 10gm --- 15gm (Detergent used"See full answer

Darpan D. - "Clarifying and Assumptions Is there any specific geography we need to restrict to? Assumption: Total worldwide. Is there any specific segment we need to restrict to? Assumption: All segments. Number of users Total worldwide users: 300,000,000 Storage per user Slice the users into 3 segments. Low users 80% Free tier 2 GB per user available Using the 80-20 rule for segmentation. Medium users 10% Basic paid tier 2 TB per user available Usi"See full answer

Joohi M. - "Assume that US and Japan are exactly opposite to each other. If a flight takes 18 hrs to travel between US and Japan and it moves at approx 600km/hr, then the distance covered is 10,800 Km. This constitutes the semi arc of the circle, so we will double is to calculate full circumference which will be 21,600 km."See full answer

Julien C. - "👇 Your feedback is very much appreciated 👇 Clarifying Questions Should we look at it worldwide or in the USA only? Should we consider all Slack messages? ones that are sent in business-owned workspaces? ones that are sent in other types of communities? We'll give numbers for this scope: worldwide all messages Approach: Nb of users x Nb messages sent by user per hour x Nb hours worked per day Nb of users: 10M Nb of messages per hour: 10 Nb of hours worked per day: 8 So an"See full answer

Ramesh Y. - "Clarifications: Is it passenger/cargo/defense Answer: Passenger Is it direct or stops included - Direct Last I read London had 80 M passengers annually Per month - 6.7 M Per Day - 220 K Assumption here - London is a hub and it has flights to all continents. Assumptions are the split below Flights to Europe -- 30% Flights to USA -- 20% Flights to Asia -- 30% Flights to Africa -- 10% Flights to Australia -- 10% Dubai is part of Asia - 30% of 220 K is 66K Within Asia - Passeng"See full answer

Hooman S. - "5000000"See full answer

Exponent - "This is another Fermi problem — an estimation or approximation problem with limited information and back-of-the-envelope calculations. There's no right answer: interviewers want to understand how you think and how well you can explain your reasoning, rather than what you already know. Recall the formula for Fermi problems: Ask clarifying questions Catalog what you know Make equation(s) Think about edge cases to add to equation **Breakdown components of your"See full answer

RockyBalboa - "Clarifications: Do we consider window for any building or only residences? I will ignore windows in cars for complexity reasons. Pardon my ignorance for not knowing the size and population of Tehran, Would you mind sharing some inputs or is it okay if pick some Randoms? Analysis: Tehran is ~300 sq. miles in terms of land area with an overall population of 9 MM with an average 3.5 members per household. _I will be moving with windows for residences only and then gut check my response"See full answer

Exponent - "This is another Fermi problem — an estimation or approximation problem with limited information and back-of-the-envelope calculations. There's no right answer: interviewers want to understand how you think and how well you can explain your reasoning, rather than what you already know. Recall the formula for Fermi problems: Ask clarifying questions Catalog what you know Make equation(s) Think about edge cases to add to equation **Breakdown components of your"See full answer

Exponent - "This is a Fermi problem — an estimation or approximation problem with limited information and back-of-the-envelope calculations. There's no right answer: interviewers want to understand how you think and how well you can explain your reasoning, rather than what you already know. Recall the formula for Fermi problems: Ask clarifying questions Catalog what you know Make equation(s) Think about edge cases to add to equation **Breakdown components of your equat"See full answer