5:09 Frequency Trees - Corbettmaths
Corbettmaths clearly explains frequency trees with two worked examples, ideal for GCSE.
Frequency trees
Use frequency trees and tree diagrams
4 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
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4 shown 5:09 
9:50 Frequency Trees
Maths Genie walks through completing frequency trees and answering the probability questions.
16:32 Probability Tree Diagrams - GCSE Maths
Excellent, thorough guide to drawing and using probability tree diagrams for successive events.
1:04 Frequency Trees Explained 🌳📊 | Probability Made Simple
Maths Genie drawing and completing probability tree diagrams to find event probabilities.