Answer :

To find median of tiffin allowance, we need to make a table calculating cumulative frequency.


For median:


We have, total frequency, N = 40


N/2 = 40/2 = 20


Observe, cf = 23 is just greater than 20.


Thus, median class = 50 – 55


Median is given by



Where,


L = Lower class limit of median class = 50


N/2 = 20


cf = cumulative frequency of the class preceding median class = 14


f = frequency of the median class = 9


h = class interval of the median class = 5


Substituting these values in the formula of median, we get




Median = 50 + 3.33


Median = 53.33


Thus, the median of tiffin allowance is Rs. 53.33.


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