The mean of five observations is 5 and t...

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

A

`4 : 9`

B

`6 : 7`

C

`5 : 8`

D

`10 : 3`

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The correct Answer is:

A

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