You already know that the probability of getting a 5 when you roll a die is . This is because the relative frequency goes towards when you have a huge amount of trials.
With the formula above, you can also find the probability of getting a 5 when you roll a die.
The number of favorable outcomes is the number of outcomes that give you a 5. Since the die has only one side with five dots, the number of favorable outcomes is 1. The die has a total of six sides. That makes the number of possible outcomes equal to 6 when you roll a die. Then the probability is