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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 deviation of the observations `lamda a_(1), lamda a_(2),….,lamda a_(n)` is

A

`lamda sigma`

B

`-lamda sigma`

C

`|lamda| sigma`

D

`lamda^(n) sigma`

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  • If a_(1),a_(2),a_(3),a_(4),...,a_(n) are n positive real numbers whose product is a fixed number c, then the minimum value of a_(1)+ a_(2) + ...+a_(n-1)+2a_(n) is-

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