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The mean and variance of 7 observations are 8 and 16, respectively. If five observations are 2, 4, 10, 12, 14, then the absolute difference of the remaining two observations is:
(1) 1 (2) 4 (3) 2 (4) 3
$x_1+x_2=14$, $x_1^2+x_2^2=100$, $x_1 x_2=48$. $(x_1-x_2)^2 = 4$. $|x_1-x_2| = 2$.
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