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A
A+
If
is the mean of
Mean of x
1
, x
2
, x
3.........
x
n
=
..............(i)
Now,
)
⇒
i
-
=
⇒
= 0.
12
is the mean of 
..............(i)
)
i - 
= 
= 0. is the mean of ..............(i))i - = = 0.