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Typical value and spread

Typical value and spread

Ordered scores on a number line with a matching box plot labelled Q_1 = 18, median = 20, Q_3 = 22, and IQR = 4 When we describe data, we usually want one number for a typical value and one number for spread. Typical values include the mean and median, while spread can be shown by the range or the interquartile range.

Data Lesson

  1. IGCSE
  2. /Maths
  3. /Data

Step-by-step lessons on Edexcel IGCSE Maths Data. Each one builds up to exam-style questions. Build confidence with the shared Foundation-tier content first, since roughly 40% of Higher-tier marks are targeted at the grades 4–5 boundary that both tiers have in common.

Lessons