Mathematics · University
Descriptive statistics · revision notes
The arithmetic average of numerical observations.
Key ideas and conditions
Mean
The arithmetic average of numerical observations.
Median
The central ordered value or midpoint of the central pair.
Standard deviation
A measure of typical spread around the mean.
Quartile
A cut point dividing ordered data into four broad parts.
Explain without looking
- Give a short example showing how Standard deviation would be used in practice.
- Summarize why Quartile matters in the lesson “Descriptive statistics”.
Further reading and review references
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