Probability frequency

The topic of frequency has already been mentioned in the context of statistics. This time we will deal with the topic of frequency related to the field of probability. So what is the relationship between frequency and probability?

In fact, frequency in probability (in the same way as frequency in statistics) expresses the number of times a certain datum appears within the group in question.

Let's remind ourself some basic definitions:

Probability: A measure of the likelihood of an event, expressed as a number between 0 and 1.
Frequency: The number of times an event occurs within a set period or trial.

Probability frequency is important because it carves our way to relative frequency, a way of estimating probability based on past events. It is calculated by dividing the frequency of an event (how many times it happened) by the total number of trials or observations. Relative frequency provides a practical approach to understanding probability, based on the probability frequency.

Let's demonstrate this with an example.

There is a plate on the table on which vegetables are lying: $4$ tomatoes, $2$ cucumbers and $3$ onions.

We are asked to express the frequency of cucumbers.

Let's look again at the data we have and we will see that the frequency is expressed in the number of times a certain object appears in the set, in our case there are $2$ cucumbers, therefore, the frequency of cucumbers is $2$ .

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