2026

Probability Interview Questions 2026

A current, 2026 snapshot of the Probability interview questions worth knowing — kept up to date as frameworks and best practices evolve, so you prepare with what companies are actually asking in 2026.

58Questions18Beginner27Intermediate13Senior

58 Probability questions

  1. 1What is the intuition behind law of total expectation?Intermediate
  2. 2What is independence in probability distributions?Intermediate
  3. 3What is the difference between discrete and continuous random variables in modeling?Intermediate
  4. 4What is conditional expectation?Intermediate
  5. 5What is the intuition behind joint and marginal distributions?Intermediate
  6. 6What is the intuition behind probability density function (PDF)?Intermediate
  7. 7What is covariance and how is it different from correlation?Intermediate
  8. 8What is the difference between variance and standard deviation?Beginner
  9. 9What is the difference between expectation and variance intuitively?Intermediate
  10. 10What is KL divergence?Intermediate
  11. 11What is entropy in probability theory?Intermediate
  12. 12What is Bayes inference in machine learning?Intermediate
  13. 13What is a Markov chain?Intermediate
  14. 14What is the law of total probability?Intermediate
  15. 15What is the difference between probability mass function (PMF) and probability density function (PDF)?Intermediate
  16. 16What is marginal probability?Beginner
  17. 17What is joint probability?Beginner
  18. 18What is the exponential distribution?Intermediate
  19. 19What is the geometric distribution and where is it used?Intermediate
  20. 20What is uniform distribution?Intermediate
  21. 21What is Poisson distribution and when is it used?Intermediate
  22. 22What is a binomial distribution?Intermediate
  23. 23What is a Bernoulli distribution?Intermediate
  24. 24What is correlation in probability?Beginner
  25. 25What is covariance and what does it measure?Beginner
  26. 26What is independence in random variables?Beginner
  27. 27What is a cumulative distribution function (CDF)?Beginner
  28. 28What is probability distribution and why is it important?Beginner
  29. 29What is a random variable in probability theory?Beginner
  30. 30What is the central limit theorem?Intermediate
  31. 31What is the law of large numbers?Intermediate
  32. 32What is variance and standard deviation?Intermediate
  33. 33What is expectation in probability theory?Intermediate
  34. 34What is the difference between discrete and continuous probability?Beginner
  35. 35What is Bayes’ theorem and why is it important?Beginner
  36. 36What is conditional probability?Beginner
  37. 37What is the difference between independent and dependent events?Beginner
  38. 38What is probability and how is it formally defined?Beginner
  39. 39Probability Interview Question 2 (Free)Intermediate
  40. 40Probability Interview Question 1 (Free)Beginner
  41. 41Probability Interview Question 5 (Free)Intermediate
  42. 42Probability Interview Question 4 (Free)Beginner
  43. 43Probability Interview Question 3 (Free)Senior
  44. 44What is entropy in probability and why is it important in ML?Senior
  45. 45What is the Poisson process?Senior
  46. 46What is a stochastic process?Senior
  47. 47What is the difference between Bernoulli, Binomial, and Geometric distributions?Senior
  48. 48What is conditional independence?Senior
  49. 49What is the intuition behind variance decomposition?Senior
  50. 50What is the difference between weak and strong law of large numbers?Senior
  51. 51What is a moment generating function (MGF)?Senior
  52. 52What is a probability generating function (PGF)?Senior
  53. 53What is Jensen’s inequality and why is it important in probability?Senior
  54. 54Probability Advanced Interview Question 10Beginner
  55. 55Probability Advanced Interview Question 9Senior
  56. 56Probability Advanced Interview Question 8Intermediate
  57. 57Probability Advanced Interview Question 7Beginner
  58. 58Probability Advanced Interview Question 6Senior

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Frequently asked questions

Are these Probability interview questions up to date for 2026?

Yes. This page reflects 58 Probability interview questions kept current with today's frameworks, tooling and interview trends, with each answer maintained and dated.

What Probability topics should I focus on in 2026?

Prioritise the fundamentals plus the modern patterns interviewers ask about now. Each question here includes a detailed answer, code example and common mistakes so you can target the highest-impact areas.

Are these questions free?

You can read the question and a short answer for free. A subscription unlocks the full detailed explanation, real-world example, common mistakes and follow-up questions for each one.