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Edexcel A-Level Mathematics AS S1.2.3 Measures of Dispersion Variance Questions

Practise variance and standard deviation from summary statistics, estimate quartiles and IQR by interpolation, and explain how shifts, scaling or added observations change spread.

Syllabus
First assessment 2019
Course
Mathematics YMA01
Level
AS

Exam points

  • calculate standard deviation or variance from Σx and Σx², then round appropriately
  • find range, quartiles or IQR, including interpolation where grouped data is given
  • interpret how a shift, scale change or added data affects variance or standard deviation

Edexcel A-Level Mathematics AS S1.2.3 Measures of Dispersion Variance Questions question 1

[Maximum number: 2]

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 S1.2.3 Measures of Dispersion Variance Questions question 1 — Edexcel A-Level Mathematics AS

find an estimate for

the standard deviation of the times taken to complete the puzzle.

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