Probability & Statistics : Probability Tree Diagram Worksheets KS4 year 9-11

these probability tree diagram word problems typically fit into middle school to early high school math.
UK Curriculum (KS3–KS4 / GCSE)

Grade/Year:
Year 9–11 (ages 13–16) — KS4 / GCSE level

Unit:
Probability → subtopic: Tree Diagrams, Combined Events, and Independent/Dependent Probability

Usually appears in the GCSE Mathematics syllabus (both Foundation and Higher tiers).

Grade:
Grade 8–10 (typically ages 13–16)

unit:
Probability and Statistics → subtopic: Compound Events and Tree Diagrams

often covered in:

8th Grade Math (basic probability)

Algebra I or Geometry (combined events, independent/dependent probability)

Curriculum Typical Grade Unit/Topic Subtopic UK (KS4/GCSE) Year 9–11 Probability Tree diagrams; combined events US (Common Core) Grade 8–10 Probability & Statistics Compound events; independent vs dependent events

these word problems fit well in a “Compound Probability” or “Tree Diagrams” lesson — often placed after introducing basic probability and before conditional probability or Venn diagrams.