Question

The mean of 30 members is 18. What will be the new mean of each number is increased by 2

Answer 1

hello !!!

let the no.'s be x1,x2,x3,x4........x30.

therefore, x1+x2+x3+x4.+.........x30/30=18

x1+x2........x30=540---------1

now , 2 is added  to every no.

=>x1+2+x2+2+x3+2..........x30+2/30=?

(x1+x2+x3......x30)+60/30=?(mean).
540+60/30=mean(?)
=>600/30=mean.
mean=2o answer , new mean:))

hope it helps!
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