Marginal PDFs obtained by integrating out the other variable — IITM BS previous year questions

Marginal PDFs obtained by integrating out the other variable is part of Two Continuous Random Variables, Week 5 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.