Q. 85.0( 4 Votes )

Find the mean of 25 numbers if the mean of 15 of them is 18 and the mean of the remaining numbers is 13.

Answer :

Mean of 15 numbers = 18


Sum of 15 numbers = 18×15 = 270


Mean of remaining 10 numbers = 13


Sum of remaining 10 numbers = 10×13 = 130


Mean of 25 numbers =


=


Hence mean of 25 numbers is 16.


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