Data Scientist Statistics & Math Interview Questions
Practice 471 real Statistics & Math interview questions for Data Scientist roles. From companies including Meta, Capital One, Google, Amazon, Uber.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Derive Probability of Even Sum in Bernoulli Trials
Derive Probability of Even Sum in Bernoulli Trials Probability Puzzles: Parity and Runs Context You are given two independent probability problems com...
Solve coin probability and Bayesian inference problems
Coin-Flip Statistics: Pattern Racing, Runs, and Bayesian Updating You are given three independent questions about fair coin tossing and Bayesian updat...
How Does Removing Zeros Affect Sharpe?
Suppose a return series has 2n observations. Exactly n observations are 0, and the remaining n observations are non-zero returns x1, x2, ..., xn with ...
Write the logistic regression loss function
Write the logistic regression loss function Logistic Regression Loss Consider binary logistic regression. - Dataset: \(\{(\mathbf{x}_i, y_i)\}_{i=1}^n...
Estimate laptops in an office
Give a back-of-the-envelope estimate for how many laptops are physically present in a typical corporate office at a given moment. State your assumptio...
Measure Causal Impact of Self-Selected App Redesign
Measure Causal Impact of a Self-Selected App Redesign A mobile app ships a redesigned UI as a new version. Users opt in by upgrading, so a standard ra...
Compare queueing systems and common distributions
LinkedIn Data Scientist Statistics Fundamentals You are asked a series of statistics fundamentals questions in a data science technical screen. Constr...
Optimize interval-scoring strategy
Optimize interval-scoring strategy Five-Round Interval-Estimation Game: Optimal Intervals and Risk Allocation You play five independent rounds. In rou...
Compute variance of trading profits
Compute variance of trading profits Symmetric Random Walk Trading Strategy: Profit Variance and Expectation Setup - Let S_t be a simple symmetric rand...
Calculate Probability and Statistics for Dice Roll Outcomes
Calculate Probability and Statistics for Dice Roll Outcomes Dice Rolls and the Binomial Model Scenario A casino analyst models dice rolls to understan...
Forecast and Analyze DoorDash Menu Price Inflation Gap
Forecast and Analyze DoorDash Menu Price Inflation Gap DoorDash wants to understand and forecast the difference between on-platform menu prices and th...
Estimate Family Proportions and Explain Regression Anomalies
Estimate Family Proportions and Explain Regression Anomalies On-site Statistics Round Task Overview You are given a population of families that have e...
Compute probability an account is fake
This question evaluates understanding of conditional probability and Bayesian reasoning, specifically interpreting base rates alongside true positive ...
Estimate constant under absolute loss
Suppose you have observed target values \(y_1, y_2, \dots, y_n\), and you want to fit the simplest possible model that predicts the same constant valu...
Solve core probability/statistics mini-problems
Answer the following probability/statistics interview questions. Assume all randomness is independent unless stated otherwise. 1) Radioactive decay (h...
Plan and analyze an A/B test
This question evaluates expertise in experimental design and applied statistics — specifically power and sample-size calculations, clustering and desi...
Calculate profit and break-even across pricing models
Unit Economics and Break-even Analysis for a Cloud-Storage Startup You are analyzing a cloud-storage startup that currently charges unit-based pricing...
Compare Normal vs Poisson; test dispersion and approximate tails
You collect n=200 independent minute-level event counts with sample mean x̄=14.5 and sample variance s²=16.2. 1) Under a Poisson(λ) model, derive the ...
Compute sample size and test duration correctly
Powering Two Online Experiments: Sample Size, Duration, and Design Defenses You are designing experiments to improve a friend-accept rate metric in a ...
Explain p-value and choose correct test
Technical Screen: P-values and Robust Two-Sample/Paired Tests Context: You are a data scientist evaluating healthcare interventions. Answer in clear, ...