In a statistical investigation, the expression of the ratio of the tally of a modality or a value of the character studied and the total number of results, in the form of a decimal number or a percentage.
If the statistical character is continuous, we call the frequency f of a class the ratio of the tally of this class and the total tally of the distribution.
Distribution of students at Springfield School
|6 – 7||40||40||21.2||21.2|
|8 – 9||45||85||23.8||45.0|
|12 – 13||56||189||29.6||100.0|