Probability resources
Mathematics, grade 11. Notes, worksheets, videos, interactive tools and revision materials for this chapter.
Notes
Study notes
The chapter's lessons are the notes — read them in order, then use the resources below.
01Probability scale and basicsThe 0 to 1 scale, equally likely outcomes, and writing probabilities as fractions, decimals or percentages.Read lesson →02Combined outcomesSample space diagrams and listing all outcomes for two-step experiments.Read lesson →03Independent and mutually exclusive eventsMultiplying probabilities for independent events and adding for mutually exclusive ones.Read lesson →04Tree diagrams and conditional probabilityBuilding tree diagrams for events with and without replacement, and finding conditional probabilities.Read lesson →
Worksheets
Practice worksheet
Attempt every question before revealing the answer — that struggle is where learning happens.
Practice questions live inside each lesson — work through them there, then return for revision.
Videos
Watch and learn
Hand-picked searches to find a clear video explanation of each lesson.
Probability scale and basics — explainedYouTube search · opens in a new tabWatch →Combined outcomes — explainedYouTube search · opens in a new tabWatch →Independent and mutually exclusive events — explainedYouTube search · opens in a new tabWatch →Tree diagrams and conditional probability — explainedYouTube search · opens in a new tabWatch →
Revision
Revision checklist
Can you explain each of these out loud, without looking? If not, re-read that lesson.
- Probability scale and basics: The 0 to 1 scale, equally likely outcomes, and writing probabilities as fractions, decimals or percentages.
- Combined outcomes: Sample space diagrams and listing all outcomes for two-step experiments.
- Independent and mutually exclusive events: Multiplying probabilities for independent events and adding for mutually exclusive ones.
- Tree diagrams and conditional probability: Building tree diagrams for events with and without replacement, and finding conditional probabilities.
- Read each lesson's summary and re-do its practice questions from memory.