In this activity, we'll be looking at probability and using a chance line.

So, how is probability measured?

Probability is measured on a scale from 0 to 1.

If something is **impossible**, it has a probability of **0** that it will happen.

If something is **just as likely to happen as not** (even chance), it has a probability of **½** that it will happen.

If something is **certain**, it has a probability of **1** that it will happen.