Concept · 4 steps · NESA MA4-PRO-C-01

Probability of Chance Experiments

How likely is it, really? Spinners, dice and coins all answer the same question — and once you can count outcomes, you can put a number on almost any chance.

1Where it comes fromProbability is just favourable outcomes ÷ total. Spin it and watch. 2How to do itList the sample space, count, write it as a fraction. 3Where it gets tricky0 to 1 only, outcomes must be equally likely, and small samples lie. 4Out in the wildWeather, raffles, games — and designing a spinner backwards.

← This concept rests on

Fractions, Decimals & Percentages
Equivalent Fractions

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Probability of Complementary Events