1.

The average of 25 result is 18. The average of 1st 12 of them is 14 & that of last 12 is 17.Find the 13th result.

Answer»

Clearly 13th result=(sum of 25 results)-(sum of 24 results) 

=(18*25)-(14*12)+(17*12) 

=450-(168+204) 

=450-372 

=78. 



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