Author note — to cover

Draw probability trees with one fork per stage and a probability on every branch, each fork summing to 1; complete missing branches by complements; fractions and decimals. One and two stages. Both tiers. Route calculations follow on the sibling pages; frequency trees carry counts and have their own page. (P6, P8)

• Fluency — direct questions on drawing a tree diagram, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).