Question

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

Answer 1

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Answer 2

given that ,
mean of 20 numbers =18
sum of observation / no.of observation=18
sum of 20 observation =18×no.of observation
sum of 20 observation =18×20=360
when three is added ,then
sum of 20 observation =360+3=363
then of new once =363/20
=18.15