Review of random variables, PMF, CDF and expectation from Statistics 1 — IITM BS previous year questions

Review of random variables, PMF, CDF and expectation from Statistics 1 is part of Course Orientation and Probability Refresher, Week 1 in Statistics 2. Prasnya files every IIT Madras BS previous year question from this subtopic here, each one with a worked explanation. Take the whole set as a timed mock and you get accuracy, pacing and per-question analysis back.