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A box contains 6 pens , 2 of which are defective Two pens are taken randomy from the bax .If r,v. X., : Number of defective pens obtained , then stand

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A box contains 6 pens , 2 of which are defective Two pens are taken randomy from the bax .If r,v. X., : Number of defective pens obtained , then standard deviation of x=
A. `+-(4)/(3sqrt(5))`
B. `(8)/(3)`
C. `(16)/(45)`
D. `(4)/(3sqrt(5))`
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Correct Answer - D
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