This is a complete lesson on probability trees that extends previous learning on tree diagrams to include selection without replacement. The lesson is designed with the new GCSE specification in mind.

- To use probability trees to calculate probabilities.
- To understand selection with or without replacement.

This pack is designed for GCSE higher or foundation tier students. It could also be used with Key Stage 3 students.

Included in this download are the following:

- Full lesson plan for the ‘Probability Trees (Without Replacement)’ lesson, including introduction, teaching content, individual activities, plenary and suggested support and extension activities
- Keyword Anagrams
- Example Tree Diagram (Without Replacement)
- Student Worksheet on Probability Trees (Without Replacement)
- Probability Fact Sheet
- Complete Solutions to all Questions

This is the eighth lesson in the ‘Probability’ unit of work (foundation tier) and also the seventh lesson in the ‘Probability’ unit of work (higher tier).

The Probability (Foundation Tier) unit is **available as a pack** including homework activities and a unit assessment. The other lessons in the unit are:

**Lesson 1 – Likelihood & The Probability Scale****Lesson 2 – Calculating Probabilities****Lesson 3 – Experimental & Theoretical Probability****Lesson 4 – Relative Frequency & Expected Frequency****Lesson 5 – Sample Space Diagrams****Lesson 6 – Probabilities of Independent Events****Lesson 7 – Probability Trees (With Replacement)**

The Probability (Higher Tier) unit is also **available as a pack** with homework activities and a unit assessment. The other lessons in this unit are:

**Lesson 1 – Calculating Probabilities****Lesson 2 – Experimental & Theoretical Probability****Lesson 3 – Relative Frequency & Expected Frequency****Lesson 4 – Sample Space Diagrams****Lesson 5 – Probabilities of Independent Events****Lesson 6 – Probability Trees (With Replacement)****Lesson 8 – Conditional Probability****Lesson 9 – Probability & Venn Diagrams**