Frequency = frequency/total number. Frequency is the numerical value of an actual situation, that is, the frequency of a certain situation under human operation. Frequency is generally expressed in decimals.

Under the same conditions, n experiments were carried out. In these N experiments, the frequency ratio of event A is m, and the frequency of event A is m/n. With the frequency (or frequency), we can know the distribution of numbers.

Extended data:

Frequency distribution histogram

In rectangular coordinate system, the horizontal axis represents the sample data, and the vertical axis represents the ratio of frequency to group distance. The frequency of each group in the frequency distribution table is expressed by the size of the corresponding rectangular area, so the statistical chart drawn is called the frequency distribution histogram, and several important data solutions of the frequency distribution histogram.

Median: the abscissa of a straight line parallel to the Y axis, which divides the histogram of frequency distribution into two parts with equal area.

Mode: the abscissa of the midpoint of the bottom of the highest rectangle in the frequency distribution histogram.

Supplement: The area of each rectangle in the figure is equal to the frequency of the corresponding group.