The sum of deviations of \( n \) observations about 25 is
P 25 and ...
The sum of deviations of \( n \) observations about 25 is
P 25 and sum of deviations of the same \( n \) observations
W about 35 is -25 . The mean of observations is
(1) 25
(2) 30
(3) 35
(4) 40
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