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If `x_(1),x_(2)……..x_(n)` be n observation and `barx` be their arithmetic mean .Then formula of the standard deviation is given by

A

Standard deviation for `2x,2x_(2),2x_(3)`…….`2x_(n)` is `sqrt(2)sigma`

B

Standard deviation for `2+x_(1),2+x_(2),2+x_(3),….2+x_(n)` is `2+sigma`

C

Variance `3x_(1),3x_(2),3x_(3),…,2x_(n)` is `9sigma^(2)`

D

Mean of `5+x_(1),5+x_(2),5+x_(3)…,5+x_(1)` is `bar(x)`

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The correct Answer is:
C
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