Q. 30 A5.0( 4 Votes )

The following dis

Answer :


We know the formula of mean is given by,


Mean =


Substituting mean = 18, ∑fixi = 704 + 20k & ∑fi = 40 + k in the above equation, we get


18 =


18 (40 + k) = 704 + 20k


720 + 18k = 704 + 20k


20k – 18k = 720 – 704


2k = 16


k = 16/2


k = 8


Thus, k = 8.


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