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[" Let "x(1),x(2),...,x(n)" be "n" obser...

[" Let "x_(1),x_(2),...,x_(n)" be "n" observations such that "],[sum x_(1)^(2)=400" and "Sigma x_(1)=80." Then a possible "],[" value of "n" among the following is "],[[" 1) "15," 2) "18," 3) "9," 4) "12]]

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