#321
Sample space diagrams
Probability · Grade 4–6
Strand: Probability
Substrand: Theoretical probability
Sparx code: U104
Sparx levels: 1, 2, 3, 4, 5
Key steps (method)
- Write down the given information and what you are asked to find for Sample space diagrams.
- Choose a representation that fits the topic (diagram / table / algebra / graph) and set it up neatly.
- Apply the topic rule(s) step-by-step, showing enough working to keep method marks.
- Substitute values carefully (watch brackets, negatives, and order).
- Write the final answer clearly with correct units/rounding.
- Do a quick check that the answer is sensible for the context.
Common mistakes
- Using the right idea but the wrong rule/interpretation for the topic.
- Skipping key working so method marks can’t be awarded.
- Sign/bracket errors when substituting or rearranging.
- Rounding too early or to the wrong accuracy.
- Not checking whether the answer is reasonable.