To represent probabilities on the number line we will draw a horizontal or a vertical axis and mark the two numbers and . 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.
Inside a vase there are red balls and 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 and .
Let's look at the data we have.
In the vase there are red balls and blue balls, that is, in total there are balls.
We have a probability of 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).
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 and , i.e. at .
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