Sample covariance (sxy) vs population covariance (σxy) — IITM BS previous year questions

Sample covariance (sxy) vs population covariance (σxy) is part of Covariance (L4.6 - L4.7), Week 4 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.