The mean of 'n' observations is tildex. ...

The mean of 'n' observations is `tildex`. If the first observation is increased by 1. The second by 2, the third by 3 and so on, then the new mean is equal to:

A

`tildex+(2n+1)`

B

`tildex+((n+1))/2`

C

`tildex+(n+1)`

D

`tildex-((n-1))/2`

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The correct Answer is:

D

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