B.1.2—Arithmetic and weighted means

Calculate arithmetic and weighted means, including relative atomic mass from isotopic abundances, and select concordant titration data after identifying outliers.

Use b.1.2—arithmetic and weighted means to connect the rule to the data and decision in the question.

This matters because b.1.2—arithmetic and weighted means determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.1.2—arithmetic and weighted means to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.1.2—Arithmetic and weighted means is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.