Question Bank

Problems

Title	Difficulty	Language	Company	Topic
Bias-Variance Tradeoff Free	Easy	Conceptual	—	machine-learning
Central Limit Theorem Free	Easy	Conceptual	—	statistics
Count by Department Free	Easy	SQL	—	group-by
Filter by Salary Free	Easy	SQL	—	where
FizzBuzz Free	Easy	Python	—	basics
Moving Average	Easy	Python	—	pandas
Reverse String	Easy	Python	—	strings
Select All Employees Free	Easy	SQL	—	select
Two Sum Free	Easy	Python	Google Amazon Meta	arrays
Feature Scaling	Hard	Python	—	feature-engineering
K-Nearest Neighbors	Hard	Python	Netflix Spotify	machine-learning
Rank Employees	Hard	SQL	—	window-functions
Running Total	Hard	SQL	Amazon Stripe	window-functions
Year over Year Growth	Hard	SQL	—	ctes
Average Salary by Department	Medium	SQL	—	group-by
Bayes' Theorem Application	Medium	Conceptual	—	probability
Calculate Correlation	Medium	Python	—	statistics
Department with Highest Average	Medium	SQL	—	subqueries
Employee Manager Join	Medium	SQL	—	joins
Group Anagrams	Medium	Python	Google Meta	strings
Merge Sorted Lists	Medium	Python	Microsoft Amazon	arrays
Missing Data Imputation	Medium	Python	—	pandas
Precision vs Recall	Medium	Conceptual	Google Meta	machine-learning
Top N Salaries	Medium	SQL	—	subqueries