S2.2.4 - Mean and variance of continuous random variables

Mean and variance of continuous random variables.

Use mean and variance of continuous random variables to connect the rule to the data and decision in the question.

This matters because mean and variance of continuous random variables determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply mean and variance of continuous random variables to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Mean and variance of continuous random variables is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.