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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

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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 

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2 Answers

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Best answer

Correct option: (2) 4 : 9

Explanation:

+1 vote
by (66.1k points)

Correct option: (2) 4 : 9

Explanation: 

Let the req. observation are a, b 

=> a + b + 12 = 25

=> a + b = 13 &

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