class interval

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Numerical data may be grouped by dividing the set of possible values into so-called class intervals and counting the number of observations in each interval. For example, if the possible marks obtained in a test lie between 0 and 99, inclusive, groups could be defined by the intervals 0–19, 20–39, 40–59, 60–79 and 80–99. It is often best (but not essential) to take the class intervals to be of equal widths.

Subjects: Mathematics.

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