Google Estimation Interview Questions

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

Saurao D. - "Estimate how many potholes there are across the continental USA. Continental USA=? USA area: 9.834~9 Mn km² Considering 10% constitutes of water bodies Land: 8.1~8Mn km² Land will comprise of residential area, commercial area, inner roads and highways Residential area: 2.5% Commercial area:2.5% Inner roads: 2.5% Highways: 2.5% Barren Land: 30% Forest: 30% Grassland: 30% Highways don't have potholes. Also Barren Land and Forest will not be considered. So, Residential area: 2.5%= 0.2Mn"See full answer

Anonymous Muskox - "Clarification Questions Do we need to calculate what we are seeing and processing or we want to process our unconscious thoughts in the memory as well? [You can have ] And we need to calculate the amount of storage for a person in single day? [Yes] For more product management interview experience https://technomanagers101.blogspot.com/ High Level Formula = (24 hours - 6 hours of sleep(assuming no processing))([(4 hours of Concentration)(3.5 GB/hr analogous to movie playing at 108"See full answer

Debajyoti B. - "Assuming we have to consider sms sent by people & not company messages, promotions etc Total population of USA- 300 mil Poverty rate- 10% Remaining 270 mil Avg members per household- 4 Total households- approx 70 mil Kids(25) prefer whatsapp over traditional messaging nowadays unless absolutely necessary, so fo"See full answer

Sanjay P. - "Its my first post to answer such questions. Please do let me know your feedback for my improvement please. How many planes flying over city are at the moment Let meshare my understanding on the question, we want to estimate number of aeroplanes flying over city at any moment. Assumption: City:Hyderabad India On average A flight takes 5 min to cross city. We are going to average out as certainly number of planes on Sky in Night is far less than number of planes in Day, so ignor"See full answer

Greg W. - "Equation = (# of phones sold in Africa every month * % pixel market share) Africa population = 1.5 billion Smartphone penetration = assume 50% Assume smartphone penetrations grows 1% per year Assume 2 year smartphone renewal cycle Current smartphone population = 1.5B x 50% = 750M Each year 50% of this populations gets a new phone = 375M 375M / 12 = ~31M per month New smartphone population each year = 1.5B x 1% = 15M 15M / 12 = ~1 per month 31M + 1M = 32M smartphones sold per month US mar"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

Ananya M. - "Assumption: question is about people in the US, and we define frequent bar visitor as someone who visits a bar twice a week. we are defining bars as places that people go for alcoholic beverage , not for the snacks , non alcoholic beverage or sports TV population of use 330M , 80m per age group 0-20 (eliminate because drinking age is 21 and above) 60-80 (eliminate because they prefer drinks at home or sit down restaurants or are very health conscious to go drinking) 20-30 : 40m 80%"See full answer

S H. - "Clarifications Only travellers to be considered? Or should we consider work staff, people who come to receive and see off people when they are traveling? → In essence who is considered to the count? → Assumption, only travellers. If not then you have to consider, staff (ATC, Security, Airlines ground staff, Customs, shop employees, airport staff etc.) making the estimate very difficult, But If I had to guess I would say 5% of total travellers across all the staffing categories. Estimate"See full answer

Adam C. - "Five to ten"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

Bipin R. - "US Population = 330M Smartphone users (80 percent penetration) = 264M Apple has roughly 40 percent market share and Samsung has 30 percent. Pixel has the roughly 2 percent market share. Total Pixel users = 2 percent of 264M = 5.3M users"See full answer

Ananya M. - "assuming food delivery is about convinience not transport ex: household with working members who own a car might still order in instead of driving. to a restaurant for convenience excludes tips and taxes HH = 100M 90% internet penetration low : mid : high income : 20:50:30 preference for the service 30% (bike service would be slower, one needs to keep that in mind +NY has so many food options , people could cook, meal delivery service, uber eats door dash ) HH with internet penetration that can"See full answer