MEDIAN OF UNGROUPED DATA
1.    MEDIAN
    The median is the value which is strictly in the middle of the list of the observations when written in order of size, i.e., in ascending or descending order. It is also a measure of central tendency.
    (i)    When the number of observations is odd, then there will be only one mid term and this term is the median. 
           n = number of terms
           If n = odd

(ii)    When the number of observations is even, then there will be two middle terms. The average of these middle terms will be the median of the data.
        If n = even

Illustration 8
        Find the median of:
        (i) 5, 9, 6, 4, 7, 2, 8                 (ii) 2, 5, 3, 2, 4, 5, 2, 4, 6, 8, 7, 9, 7.

Illustration 9
        Find the median of the following data:
             11, 10, 12, 9, 8, 16, 15, 14