LEARN · EXPLAIN · REVISE

For observations k,k+2,k+4, find the sample mean.

Read the idea, work independently, then explain what changed.

TOPIC 01

Statistics: mixed assessment

A mixed assessment: identify the method, justify it and revise your reasoning.

Use one hint at a time. A correction explains what changed, not just the final answer.

01 / Standard#Your turn

k=10

Skills and prerequisite lessons

Working and explanation

BUILD THE REASONING

Hint 1

Translate counts into sample proportions and keep classes, units and uncertainty visible.

Hint 2

Add all observations and divide by their count.

Worked solution

Translate counts into sample proportions and keep classes, units and uncertainty visible.
Calculate or simplify this relation.
$\bar x=(10+12+14)/3=12$
Every observation is equally weighted in this unweighted sample.

The requested value is 12.

Checks and common pitfalls: Every observation is equally weighted in this unweighted sample.

Think first. Reveal a hint when the class is ready.

Teacher preparation and assessment