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In a Poisson distribution P(X=0) =2P(X=1...

In a Poisson distribution P(X=0) =2P(X=1) then the standard deviation =

A

`(1)/(2)`

B

`(1)/(sqrt2)`

C

`(1)/(3)`

D

`(1)/(sqrt3)`

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The correct Answer is:
B
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