Answer :

Draw the table as below,



We have;


N = 34 (even number)


Median =





Now,


∑fx = 407 and ∑f = N = 34


Mean =


Hence,


Mode = 3(median) – 2 (mean)


= 3×12 - 2×11.97


= 36 – 23.94


= 12.06


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