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The mean of five observation is 4 and their variance is 5.2 . If three of these observations are 1,2 and 6, then the other two are,A. 2 and 9B. 3 and 8C. 4 and 7D. none of these |
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Answer» Correct Answer - 3 Let two unkown observation are x and y `barx= 4 = (1 + 2 +6 + x+y)/(5)` `x + y = 11" "...(1)` `sigma= 5.2` `(1^(2)+2^(2) +6^(2) +x^(2) + y^(2))/(5) -(barX)^(2) = 5.2` `x^(2)+ y^(2) = 65" "...(2)` by (1) and (2) `x = 4, y= 7` or ` x= 7, y = 4` |
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