Where,

l = lower class boundary of the median class
h = Size of the median class interval
f = Frequency corresponding to the median class
N = Total number of observations i.e. sum of the frequencies.
c = Cumulative frequency preceding median class.

Problem: In a work study investigation, the times taken by 20 men, in a firm, to do a particular job were tabulated as follows: Find the median.

 

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