Question

The Harmonic mean of x1, x2... is
(1) n-Ex
(2) n Σf
(3) nfs
(4)\nΣ(1x)​

Answer 1

Answer:

Let the n numbers be x1, x2, ..., xn then xˉ=n∑i=1nxi

When each number be divided by 4 then new numbers be 4x1,4x2, ..., 4xn

∴   New mean =n4x1+4x2+...+4xn

     41[nx1+x2+...+xn]

     =41{n1