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a+2 , b+2 , c+2 are 3 observations such ...

a+2 , b+2 , c+2 are 3 observations such that b=a+c , and a+2 , b+2 , c+2 has standard deviation = d Then

A

`b^2=3(a^2+c^2+d^2)`

B

`b^2=a^2+c^2-d^2/9`

C

`b^2=a^2+c^2+d^2/9`

D

`b^2=3(a^2+c^2)-9d^2`

Text Solution

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The correct Answer is:
D
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