IGCSE Geography / Geographical skills

Quartiles and the interquartile range revision notes

Edexcel International GCSE Geography (4GE1), chapter 11: Geographical skills, specification point G8. Part of the full course.

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Quartiles divide ordered data into four parts, and the interquartile range measures the spread of the middle half. They help you compare data and see how extreme values affect the range.

More lessons in Geographical skills

• Grid references, scale and distance
• Contours, relief and cross-sections
• Describing distributions and patterns on maps
• Photographs, satellite images and GIS
• Choosing and reading graphs
• Mean, median, mode and range
• Percentages, percentage change, ratio and proportion
• Scatter graphs and lines of best fit