Year 9 Mathematics – Term 3 (WA Curriculum): Probability and Statistical Analysis

What this unit covers

In Term 3, Year 9 Mathematics in the WA Curriculum centres on the unit “Probability and Statistical Analysis”.

Students explore probability concepts including independent and dependent events, analyze multi-variable data using statistical measures, create data representations, and evaluate sampling methods and chance variation.

Lesson sequence (30 lessons)

The unit breaks down into the following lesson-by-lesson sequence — each title below is a teachable lesson, in order:

1. Introduction to Probability Outcomes and Sample Spaces
2. Understanding Independent and Dependent Events
3. Drawing Without Replacement - Basic Concepts
4. Creating Tree Diagrams for Two-Stage Events
5. Calculating Probabilities Using Tree Diagrams
6. Ping-Pong Ball Probability Experiments
7. Two-Digit Number Formation Probabilities
8. Introduction to Compound Events
9. Designing Experiments for Compound Events
10. Chocolate Box Probability Experiments
11. Estimating Probabilities Through Repeated Trials
12. Comparing Theoretical and Experimental Probabilities
13. Analyzing Multi-Variable Data Tables
14. Calculating Proportions and Percentages from Data
15. Finding Statistical Measures for Multi-Variable Data
16. Australian States Data Analysis Project
17. Creating Histograms and Line Graphs
18. Designing Stem-and-Leaf Plots
19. Constructing Two-Way Tables and Venn Diagrams
20. Building Infographics and Non-Standard Representations
21. Analyzing Shape, Spread and Centre in Data
22. Interpreting Back-to-Back Stem-and-Leaf Plots
23. Identifying Clusters, Gaps and Outliers
24. Comparing Data Distributions
25. Understanding Sampling Methods
26. Evaluating Sample Representativeness
27. Identifying Bias and Measurement Errors
28. Analyzing the Effect of Sample Size
29. Assessing Data Validity and Reliability
30. Real-World Statistical Investigation Project

Curriculum codes in this unit

Content codes:

Reading the codes: WA codes (the ones starting with WA) pack the year level, learning area, strand and content number into one string, while the national Australian Curriculum v9 uses a different anatomy that starts with AC9 — same content family, different labels. Our complete WA Curriculum guide decodes both, character by character.

Planning notes for Term 3

WA terms run roughly 9–11 weeks, and in 2026 Term 3 runs from Monday 20 July to Friday 25 September — 10 weeks for WA public schools. With 30 lessons in this unit, that leaves breathing room for assessment, moderation and the weeks that disappear to carnivals, camps and public holidays — plan the assessable work to land two to three weeks before the end of term rather than in the final week.