Standard Deviation of n observations a(1...

Standard Deviation of n observations `a_(1), a_(2), a_(3),….a_(n)` is `sigma`. Then the standard deviationb of the observations `lambda a_(1), lambda a_(2),…….lambda a_(n)` is

`lambda sigma`

`-lambda sigma`

`|lambda|sigma`

`lambda^(n)sigma`

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