Probability Representation on a Number Line

To represent probabilities on the number line we will draw a horizontal or a vertical axis and mark the two numbers 0 0 and 1 1 . The closer the probability mark is to zero, the lower the chance that a certain event will occur. The closer the probability mark is to one, the greater the chance that a certain event will occur.

B  - Probability Representation on a Number Line

Let's demonstrate this with an example

Inside a vase there are 7 7 red balls and 7 7 blue balls. We choose a ball from the vase at random.

We are asked to calculate what is the probability that we take a red ball out of the vase.

Let's start by drawing the number line and marking the numbers 0 0 and 1 1 .

Let's look at the data we have.

In the vase there are 7 7 red balls and 7 7 blue balls, that is, in total there are 14 14 balls.

We have a probability of 50 50 percent of getting a red ball out of the vase, i.e. half, we will either get a red ball or we will not get a red ball (i.e. we will get a blue ball).

B1- Representation of probability on the number line, 50% probability of drawing a red ball.

In other words, if we want to mark the probability of getting a red ball out of the vase we will do it exactly in the middle between 0 0 and 1 1 , i.e. at 0.5 0.5 .


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