The mean of four observations is ' 4 ' and their variance is 3.5 . If two these observations are....

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The mean of four observations is ' 4 ' and their variance is 3.5 . If two these observations are 3 and 4
\( \mathrm{P} \)
then the other two are:
W
(1) 2
(2) 7
(3) 5
(4) 6



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