The means and standard devation of the ...

The means and standard devation of the marks of `200` candidates in half early exam were found to be `40` and `15` respectively. The marks of the candidates exceeds their marks by `10` in final exam. The mean and standard deviation of the marks in final exam are respectively ?

`50, 25`

`50, 15`

`30, 25`

`30, 15`

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The meanand …………
Standard deviation is independent of origin shifting

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