Statistical Class

Each of the successive intervals in which is divided the total interval of variation of a quantitative statistical variable.

The size of these intervals is called the amplitude of the statistical class.

Example

Mass of 190 students at school
Mass (in kg)	Numbers of students
[36, 38) [38, 40) [40, 42) [42, 44) [44, 46) [46, 48) [48, 50) [50, 52)	14 20 25 35 44 32 15 5
Total	190

Based on this table, we grouped the data into 8 classes. The amplitude or dimension, or range) of each class is 2. For the class [36, 38), the lower bound is 36 and the upper bound is 38. The frequency of the class [36, 38) is 14. The range of the distribution is 23, because: E = 52 − 36 = 23.

Statistical Class

Example

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