InterviewSolution
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InterviewSolution
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If the mean of the observation x, x+3, x+5, x+7 and x+10 is 9, then mean of the last three observations isA. `10(1)/(3)`B. `10(2)/(3)`C. `11(1)/(3)`D. `11(2)/(3)` |
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Answer» Mean = 9 `rArr (x+x+3+x+5+x+7+x+10)/(5) = 9` `rArr 5x+25 = 45` `rArr x = 4` Last three observations are 4+5, 4+7, 4+10 i.e., 9,11,14 ` "Mean"= (9+11+14)/(3) = (34)/(3) = 11(1)/(3)` Hence, (c) is the correct answer. |
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