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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