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A box contains 6 pens , 2 of which ...

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))`

Text Solution

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The correct Answer is:
D
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