QS3—Means, medians and quantiles

Understand and use the mean and median at AS; at A2, also understand and use relevant percentiles, deciles, quintiles and quartiles.

Use qs3—means, medians and quantiles to connect the rule to the data and decision in the question.

This matters because qs3—means, medians and quantiles determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply qs3—means, medians and quantiles to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: QS3—Means, medians and quantiles is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.