A chance experiment is something that happens where the outcome is unknown. For example, if we flip a coin, we don’t know if the result will be a head or a tail. An outcome of a chance experiment is something that can happen when you do a chance experiment. For example, when you flip a coin, one possible outcome is that you will get a head. An event is a set of one or more outcomes.
We can describe events using these phrases:
- Equally likely as not
For example, if you flip a coin:
- It is impossible that the coin will turn into a bottle of ketchup.
- It is unlikely the coin will land on its edge.
- It is equally likely as not that you will get a tail.
- It is likely that you will get a head or a tail.
- It is certain that the coin will land somewhere.
The probability of an event is a measure of the likelihood that an event will occur. We will learn more about probabilities in the lessons to come.