Determine Probability of Friend Request Being Fake
Quick Overview
Determine Probability of Friend Request Being Fake evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpretation in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Determine Probability of Friend Request Being Fake
Company: Meta
Role: Data Scientist
Category: Statistics & Math
Difficulty: easy
Interview Round: Onsite
##### Scenario
Probability that an incoming friend request is from a fake account
##### Question
95% of accounts are real, 5% fake; fake accounts send 10× more friend requests than real ones. If you receive a friend request, what is the probability it is from a fake account?
##### Hints
Apply Bayes’ theorem: posterior ∝ prior × likelihood.
Quick Answer: Determine Probability of Friend Request Being Fake evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpretation in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Determine Probability of Friend Request Being Fake
Meta
Aug 4, 2025, 10:55 AM
easyData ScientistOnsiteStatistics & Math
23
0
Determine Probability of Friend Request Being Fake
Scenario
You operate a platform where 95% of accounts are real and 5% are fake. Fake accounts send 10 times as many friend requests per account as real accounts.
Question
If you receive a random incoming friend request, what is the probability that it is from a fake account?
Assumptions
"10× more" means each fake account sends friend requests at a per-account rate 10 times that of a real account.
You are equally likely to receive any given friend request (ignoring network structure or targeting effects).