S3 topic guide · MNU 4-22a

S3 Probability and Expected Outcomes

Use the probability scale and calculate expected occurrences.

What to practise

Start by identifying the information in the question, choose a suitable method, and check whether the result is reasonable. Where a picture, graph or diagram helps, the protected practice flow uses one to make the relationship easier to see.

Worked example

Practice questions build from a clear example to more demanding applications. Read the units, labels and values carefully, then explain the method in your own words.

Support after a mistake

Helpful hints appear after incorrect answers. A second stage gives a different worked example with ordered steps before you retry. This is practice support, not a formal assessment.

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