The probability line is a line that shows probabilities and how these probabilities relate to each other.
Since the probability of an event is a number from 0 to 1, we can use the probability line above to show the possible ranges of probability values.
The line shows that if an event is certain or sure to happen, it will have a probability of 1.
For example, the probability that it will rain in the state of Florida at least once in a specific year is 1.
The line shows that if an event will never happen or cannot happen, it will have a probability of 0.
For example, the probability that you can pick a red ball from a bag containing 4 green balls and 5 blue balls is 0