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If sigmax=5,r =-1/2and b(yx)=-2/7 , the...

If `sigma_x=5,r =-1/2and b_(yx)=-2/7` , then the value of `sigma_y` is:

A

`7/20`

B

`20/7`

C

`-20/7`

D

`-7/20`

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