CAIE IGCSE Mathematics Limits of Statistical Conclusions

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

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

[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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