S1.5.1 - concept of a discrete random variable

The concept of a discrete random variable.

Use concept of a discrete random variable to connect the rule to the data and decision in the question.

This matters because concept of a discrete random variable determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply concept of a discrete random variable to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: concept of a discrete random variable is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.