The probability of an event happening is the number of desired outcomes divided by the number of all the possible outcomes. In this case we know that Turica selected a pen. There are 4 different colors, each of these colors has 8 pens. So the total number of pens is:
There are 32 possible pens that Turica can select. From these she wants to select a green pen, there are 8 green pens, therefore the probability is:
The probability of selecting the Green pen at random is 0.25 or 25%.