C.1.3—Simple probability

Understand simple probability, including probability in radioactive decay as an A2 application.

Use c.1.3—simple probability to connect the rule to the data and decision in the question.

This matters because c.1.3—simple probability determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c.1.3—simple probability to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: C.1.3—Simple probability is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.