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If f(x)=lambdae^(-lambdax),xgt0 is apro...

If f(x)=`lambdae^(-lambdax),xgt0` is aprobability density function of X then its variance is :

A

`(1)/(lambda^(2))`

B

`(2)/(lambda^(2))`

C

`lambda`

D

`lambda^(2)`

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a
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