Q. 64.3( 176 Votes )

100 surnames were

Answer :

The cumulative frequency of the given data can be calculated as:

As per the question,


N= 100



Hence,


Median class = 7-10


Lower limit, l = 7


cf = 36


f = 40


h = 3


Now,


Median can be calculated as:


h




= 8.05


Now, mode can be calculated as: class corresponding to maximum frequency.


Modal class = 7-10


l = 7


h = 3


f1 = 40


f0 = 30


f2 = 16



=



= 7.88


Now, mean of the following data can be calculated as:





= 8.25

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