Frequency: the proportion of the corresponding frequency in the whole event.

For example:

In an exam, 50 people took the exam, and 15 passed, so:

The passing frequency is: 15.

The passing frequency is 15 divided by 50=0.3.

Frequency is the number of times a data appears in a set of data.

Frequency is the percentage of this data in the total data.

With the increase of test times, frequency stability and probability

The frequency is variable and the probability is fixed.