A grouping of data into categories showing the number of observations in each mutually exclusive category.
Class mark(mid point):
A point that divides a class into two equal parts,
This is the average between the upper and lower class limits,
Class interval:
For a frequency distribution, having classes of the same size, the class interval is obtained by subtracting the lower limit of a class from the lower limit of the next class.
The relative frequency:
Obtained by dividing the class frequency by the total frequency.
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