If the sum of the deviations of 50 observations from
\( \mathrm{P}^...
If the sum of the deviations of 50 observations from
\( \mathrm{P}^{\mathrm{n}} \) 30 is 50 , then the mean of these observations is:
W
(1) 30
(2) 51
(3) 50
(4) 31
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