Q. 34.4( 39 Votes )

If the mean of th

Answer :

Given is the frequency distribution table for ungrouped data.

We have



Mean of such ungrouped data is given by




[ Mean = 7.2]


7.2(40 + K) = 260 + 10K


288 + 7.2K = 260 + 10K


10K – 7.2K = 288 – 260


2.8K = 28


K = 28/2.8


K = 10


Thus, K = 10.


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