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

In a poisson distribution, `P(X=0)=2P(X=1)` then, find 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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