Find how likely a single event is on a 0-to-1 scale.
Read this first — it covers the idea in plain language with a worked example.
Probability runs from 0 (impossible) to 1 (certain). One-half means an event is just as likely to happen as not.
For equally likely outcomes, probability = (number of favorable outcomes) ÷ (total number of outcomes).
A bag has 3 red and 5 blue marbles. What is the probability of drawing red?
A short video that walks through this topic.
Try a worksheet or work through some problems before the quiz.
A couple of questions to make sure this topic stuck. Retake as many times as you want.
Simple Probability
A fair die is rolled. What is the probability of rolling a 4?
