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The mean and variance of 8 observations are 10 and 13.5, respectively. If 6 of these observations are 5, 7, 10, 12, 14, 15, then the absolute difference of the remaining two observations is:
(1) 9 (2) 5 (3) 3 (4) 7
$x+y=17$, $x^2+y^2=169$. $(x-y)^2 = 49$. $|x-y| = 7$.
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