CAIE IGCSE Mathematics Core Limits of Statistical Conclusions

Practise explaining why a statistical conclusion or chosen average can be unreliable when an extreme observation disproportionately changes the mean.

Syllabus
2028–2030
Objective
C9.2.3
Level
Core

Exam points

  • inspect the data for an extreme value that pulls the mean away from the other observations
  • state why that outlier makes the mean unrepresentative instead of merely naming another average

C9.2.3 Appreciate restrictions on drawing conclusions from given data question 1

[Maximum number: 1]

Daryl records the number of hours in a week 8 people spend exercising.
5, 2, 1.5, 3, 18, 4.5, 2, 4

Explain why the mean may not be a suitable average to use.

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