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A frequency distribution in which the data is only nominal or ordinal. Ungrouped Frequency Distribution. A frequency distribution of numerical data. The raw data is not grouped. Grouped Frequency Distribution. A frequency distribution where several numbers are grouped into one class.
As probability theory is used in quite diverse applications, terminology is not uniform and sometimes confusing. 1  The following terms are used for non-cumulative probability distribution functions: 2  Frequency distribution: A frequency distribution is a table that displays the frequency of various outcomes in a sample.