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2.4 Variance and Standard Deviation
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Why spread matters

Why spread matters

Two horizontal dot plots labelled Set A and Set B, both centred on mean 5, with Set A at 4, 5, 6 and Set B at 1, 5, 9 to show different spread

A measure of location, such as the mean, tells you where the data is centred. A measure of spread tells you how tightly the values cluster around that centre.

2.4 Variance and Standard Deviation Lesson

  1. A Level
  2. /Maths
  3. /2.4 Variance and Standard Deviation

Step-by-step lessons on Edexcel A Level Maths 2.4 Variance and Standard Deviation. Each one builds up to exam-style questions. Build fluency with the core pure algebra and calculus toolkit early, since almost every mechanics and statistics topic on the course depends on it.

Lessons