FREQUENCY, defined as the number of times a data value occurs, FREQUENCY DISTRIBUTION, It is a collection of observations produce by sorting them into classes and showing their frequency, LOWER CLASS LIMIT, smallest data value that can be included in the class, UPPER CLASS LIMIT, largest data value that can be included in the class, RANGE, The difference between the highest value and the lowest value in the data set., CLASS BOUNDARIES, used to separate the classes so that there are no gaps in the frequency distribution, CLASS MARKS, midpoint of the classes., CLASS WIDTH, difference between two consecutive lower class limits, CUMULATIVE FREQUENCY, sum of the frequencies for that class and all previous classes.

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