Variance - population (σ²) and sample (s²); definitional and computational formulas — IITM BS previous year questions

Variance - population (σ²) and sample (s²); definitional and computational formulas is part of Measures of Dispersion (L3.4), Week 3 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.