Q. 114.4( 14 Votes )

The mean of 20 numbers is 18. If 3 is added to each of the first ten numbers, find the mean of the new set of 20 numbers.

Answer :

Given,


Mean of 20 numbers = 18.


Sum of these numbers = 20 × 18 = 360.


When 3 is added to each of the first ten numbers,


Total increment in sum = 10 × 3 = 30.


New sum becomes = 360 + 30 = 390


Mean of New set of numbers =


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