Progression (Sequence and Series)Hard
Question
If 
is the mean of a set of n observations x1, x2, x3,.....,xn then 
is equal to
is the mean of a set of n observations x1, x2, x3,.....,xn then is equal toOptions
A.M.D. about mean
B.S.D.
C.0
D.None of these
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