## A List of Lessons in the Probability Curriculum

## What Is Probability?

Probability is a measure of how likely (how probable) an event is to happen. Probability allows us to assign a number to the likelihood of an event: between 0 (impossible) and 1 (certain).## Dictionary Definition

The Oxford English Dictionary defines a probability as "the extent to which a particular event is likely to occur... expressed by a number between 0 and 1.-
A pig flying is impossible. It has a probability of
**0**. It will happen 0 times.

- The probability of tossing a Head from a coin toss is
.^{1}⁄_{2}

- The probability of a fully grown elephant being heavier than a man is
**1**. It is certain. In every case, the elephant will be heavier than the man.

## Where Does the Word Probability Come From?

Probability comes from the Latin word "probabilis" meaning "provable, credible".## The Curriculum

The lessons are grouped into mini-curriculum to help you organise your learning. A brief description is given for each mini-curriculum. Click the**MORE**button to learn more.

## Probability

Probability is about assigning a number to how likely an event is to happen. In this mini-curriculum, you will learn about the probability of events.

## Combined Events

We can find the probability of a single event, like tossing a Heads.
What about combined events? We might want the probability of more than one event. What if this __and__ that happen? What if that __or__ this happen?
In this mini-curriculum, you will learn about the probability of combined events.

## Tree Diagrams

A tree diagram is a diagram which shows the possible outcomes of an event and their probabilities. Each outcome is shown as a branch... which is why it is called a tree diagram. In this mini-curriculum, you will learn about tree diagrams and how to use them to calculate probabilities.

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