Probability Basics (Edexcel GCSE Maths): Quizzes

Between $0$ and $1$

The event is impossible

The event is certain

As likely as not (50-50 chance)

$\frac{\text{Favourable outcomes}}{\text{Total outcomes}}$

When all outcomes are equally likely

$1$

$0.2$

Pairs where one or the other must happen

$1$

$0.7$

$\frac{3}{8}$