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."
Approximate a percentile from buckets
Estimate a percentile from histogram bucket summaries by finding the cumulative-count bucket, avoiding midpoint bias, interpolating within the bucket ...
Determine Probability of Both Children Being Boys
Conditional Probability: Two Children A family has two children. You learn that at least one of them is a boy. Answer the questions below and state yo...
Quantify and Model Flight Delays Using Statistical Tests
Flight Delays: Quantification, Modeling, and Mitigation Testing You are a data scientist investigating flight delays using historical flight records a...
Compare Normal and Poisson Distributions in Statistics
Comparing Normal and Poisson Distributions You are modeling event counts, such as number of clicks, and continuous measurements, such as response time...
Explain Central Limit Theorem's Importance in A/B Testing
Explain the Central Limit Theorem's Importance in A/B Testing This statistics prompt asks you to state the Central Limit Theorem, explain why it matte...
Calculate Posterior Probability of Flagged User Being Bad Actor
Calculate Posterior Probability of a Flagged User Being a Bad Actor A platform runs a binary classifier that flags users who might be bad actors. You ...
Design A/B Test to Evaluate Algorithm's Revenue Impact
A/B Test a Recommendation Algorithm's Revenue Impact You are evaluating a new recommendation algorithm in a consumer marketplace app. The goal is to m...
Evaluate Email Subject Line Performance Using Hypotheses
Email Subject Line A/B Test: Hypotheses, CLT, and Sample Size An email marketing team wants to evaluate whether a new subject line improves click-thro...
Test coin fairness from 560 tails in 1000 flips
You flip a coin n = 1000 times and observe 560 tails. At significance level α = 0.05, test whether the coin is fair. - State the null and alternative ...
Why does the CLT matter?
The question evaluates a candidate's understanding of the Central Limit Theorem and related competencies in probabilistic reasoning, estimation, and c...
Explain confounding with an Uber example
Question You are interviewing for a Data Scientist role and are given access to Uber / Uber Eats data. Answer the following about confounding in causa...
Solve Markov and distribution expectation problems
Solve Markov and distribution expectation problems Statistics, Linear Algebra, and Game Theory Fundamentals 1) Stationary Distribution of a Finite Mar...
Determine knights and knaves roles
Determine knights and knaves roles Knights and Knaves Logic Puzzle Context On an island, each person is either: - Knight: always tells the truth. - Kn...
Identify Metrics to Detect Fake-Account Activity on Facebook
Identify Metrics to Detect Fake-Account Activity on Facebook Detecting and Measuring Fake Accounts Scenario Facebook wants to understand and curb fake...
Calculate Expected Flips for Heads-Tails Sequence
Calculate Expected Flips for Heads-Tails Sequence Probability Check — Waiting Time for HT Setup - You repeatedly flip a fair coin (independent flips; ...
Understand P-Value's Role in Product Decision-Making
Understand P-Value's Role in Product Decision-Making Scenario You are a data scientist presenting A/B test results to non-technical executives who mus...
Calculate Probability of Heads in Coin Flip Experiment
Calculate Probability of Heads in Coin Flip Experiment Coin Flips: Counting and Binomial Probabilities Context Assume 10 independent flips of a fair c...
Calculate Expected Comments and Confidence Interval Analysis
Calculate Expected Comments and Confidence Interval Analysis Scenario You are analyzing the distribution of comment counts per post for a social platf...
Determine Factors Influencing Airline Flight Delays Statistically
Determine Factors Influencing Airline Flight Delays Statistically Determine Drivers of Airline Flight Delays Context You are analyzing a flight-level ...
Estimate Default Rates Using Logistic Regression Model
Estimate Default Rates Using Logistic Regression Model On-site Statistical Role Play: Estimate Credit-Card Default Probability for a New Customer Segm...