Median of Grouped Data.
 
 Median:It is a measure of central tendency which gives the value of the middle-most observation in the data.
 
 Method for finding of median of Ungrouped Data.
 
 If $n$ is the number of ungrouped data, arrange the data in ascending order.
 
 Case 1: If $n$ is odd , then median = $({n+1}/2)^{th}$ observation
 
 Case 2: If $n$ is even , then median = average of $({n+1}/2)^{th}$ and $({n}/2)^{th}$ observation
 
 
 Method for finding of median of Grouped Data. 
 
 Median = $l$ + $({n/2-cf}/{f})$ $×h$
 
 where             $l$ =  lower limit of median class,
			$n$ =   number of observations,
			$cf$ =  cumulative frequency of class preceding the median class,
			$f$ =  frequency of median class,
			$h$ =   class size (assuming class size to be equal).