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The mean and variance of seven observations are 8 and 16, respectively. If 5 of the observations are 2, 4, 10, 12, 14, then the product of the remaining two observations is:
(1) 45 (2) 49 (3) 48 (4) 40
$a+b=14$, $a^2+b^2=100$, $ab=48$.
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