Mathematics · Grades 6–10
Summaries, spread and missing context · Revision sheet
Choose a numerical summary that matches the question and the data.
Learn the idea
Mean
Add all observations and divide by the number of observations.
Median
Order the observations. For an even count, average the two middle values.
Spread
The range is maximum minus minimum; it uses only the extremes.
Context
A summary does not reveal a full distribution or explain why values differ.
Explain without looking
- Two classes both have a mean score of 70. Must their score distributions be identical?
- A graph gives an average journey time without saying whether it is a mean or median. What should a reader ask?
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.