Computing E(X) and Var(X) from a given PMF — IITM BS previous year questions

Computing E(X) and Var(X) from a given PMF is part of Worked Examples - Expectation and Variance (L10.5), Week 10 in Statistics 1. 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.