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The mean of five observations is 5 and their variance is 9.20. If three of the given five observations are 1, 3 and 8, then a ratio of other two observations is:
(1) $10 : 3$ (2) $4 : 9$ (3) $5 : 8$ (4) $6 : 7$
$x_4+x_5=13$, $x_4 x_5=36$. So $x_4, x_5$ are 4 and 9. Ratio $= 4:9$.
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