Introduction to Quartiles and Interquartile Range

The video tutorial explains the concept of interquartile range (IQR) and quartiles using cumulative frequency graphs. It covers how to calculate the lower quartile (Q1), median (Q2), and upper quartile (Q3) and interpret these values in the context of exam marks. The tutorial highlights the limitations of using range as a measure of data spread due to its sensitivity to outliers and introduces IQR as a more robust alternative. The video concludes with a summary and encourages practice to reinforce understanding.

Describe the process of calculating the median from a cumulative frequency graph.

What does it mean if 75% of students scored below the upper quartile?

What is the relationship between the lower quartile, median, and upper quartile?

How can quartiles be used to summarize data?