define- data, statistics,range, class mark, class size,freguency,prinary data, secondary data.
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Range is the difference of the highest value and the lowest value of the data. Range is useful to find the class interval(CI). CI=RangeNumber of classes. For data having outliers, Interquartile range is used to represent the data. Interquartile range is the difference between the first quartile and the third quartile.
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