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if x(1),x(2)….x(10) are 10 observations,...

if `x_(1),x_(2)….x_(10)` are 10 observations, in which mean of `x_(1),x_(2),x_(3),x_(4)` is 11 while mean of `x_(5),x_(6)….x_(10)` is 16. also `x_(1)^(2)+x_(2)^(2)+….x_(10)^(2)=2000` then value of standard devition is

A

`2sqrt2`

B

`2`

C

`4`

D

`sqrt2`

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The correct Answer is:
A
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