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The mean of 11 items overline(X). If fir...

The mean of 11 items `overline(X)`. If first item is increased by 1, second item by 2 and so on, then new mean becomes `lamda` more than `overline(X)` and `lamda` is

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The correct Answer is:
6
New mean `=overline(X)+(11(11+1))/(2.11)=overline(X)+6`
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