Read the story inside the data

Collect, represent, analyse and interpret data while recognising uncertainty and bias.

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Learn the idea

Three things to notice

The mean, median and mode describe a typical value. Range, quartiles and standard deviation describe variation.

The median is often a better centre for skewed data because extreme values do not pull it as strongly.

For equally likely outcomes, probability is favourable outcomes divided by total outcomes.

Do not memorise the words alone. The worked example shows how to choose and apply the idea.

Syllabus coverage

Samples and variablesFrequency tablesStatistical diagramsCentral tendencySpreadProbability