Variance and standard deviation as numerical measures of spread — IITM BS previous year questions

Variance and standard deviation as numerical measures of spread is part of Scatter Plots and Spread, Week 3 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.