Basic Probability

Express the likelihood of an event as a fraction, decimal or percentage, and use the probability scale confidently.

Calculating Basic Probability

Use the probability formula to find the chance of an event from equally likely outcomes, and check your answers add to 1.

Experimental vs Theoretical Probability

Understand the difference between calculated (theoretical) probability and probability estimated from real trials, and know when each applies.

The Probability Scale & Language

Understand what probability means, how to place events on a 0-to-1 scale, and how to express likelihood correctly.