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Edexcel A-Level Mathematics AS S1.2.4 Skewness Questions

Practise comparing quartile gaps or mean and median to justify skewness, applying the 1.5×IQR rule to identify outliers, and interpreting box-plot evidence in context.

Syllabus
First assessment 2019
Course
Mathematics YMA01
Level
AS

Exam points

  • compare Q₂−Q₁ with Q₃−Q₂, or mean with median, to justify skewness
  • apply the stated 1.5×IQR rule to show whether a value is an outlier
  • interpret skew or outliers on a box plot in the context of the data

Edexcel A-Level Mathematics AS S1.2.4 Skewness Questions question 1

[Maximum number: 1]

The histogram shows the times taken, in seconds, by each of 260 people to complete a puzzle.

Figure for Question Edexcel A-Level Mathematics AS S1.2.4 Skewness Questions question 1 — Edexcel A-Level Mathematics AS

Describe the skewness of these data. Give a reason for your answer.

Three of the 260 people are chosen at random.

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