Optiver Statistics & Math interview questions focus on rapid quantitative reasoning and clear probabilistic thinking under time pressure. What makes Optiver distinctive is the combination of timed mental-math screens (you should expect sub-minute arithmetic rounds), probability and statistics puzzles that probe intuition about distributions, expectation, and conditional reasoning, and live interviews that assess how you communicate assumptions and tradeoffs. Interviewers typically evaluate numerical accuracy, estimation skill, understanding of core statistical concepts, and the ability to structure a quick, defensible answer. For interview preparation, practise timed mental math, core probability and statistics (expectation, variance, Bayes, hypothesis testing, concentration inequalities, and simple stochastic intuition), and short applied problems where you explain assumptions and error sources. Simulate the firm’s tests to build speed, rehearse concise explanations of your reasoning, and run mock problem-driven interviews that force you to simplify complex ideas quickly. Attention to clarity, calmness under pressure, and demonstrating how you check results will make your responses stand out.