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) $6 : 7$ (4) $5 : 8$
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) $6 : 7$\\
(4) $5 : 8$