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Median is the middle value of the series, when arranged in order of the magnitude., When a series is divided into more than, two parts, the dividing values are, , called Partition values., , Quartiles are the measures which divide, the data into four equal parts, each portion, contains equal number of observation,, There are three quartiles, , If a statistical series is divided into four, equal parts, the end value of each part is, called a quartile and denoted by ‘Q’., , The lower half of a data set is the set of all, values that are to the left of the median, value when the data has been put into, increasing order., , The upper half of a data set is the set of all, values that are to the right of the median, value when the data has been put into, increasing order., , The first quartile, denoted by Q,, is the, median of the Jower half of the data set., This means that about 25% of the numbers, in the data set lie below Q; and about 75%, lie above Q,., , The second quartile also called median, and denoted by Qa has 50% of the items, below it and 50% of the items above it.