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Given E(X)=10, Var(X)=25 where X is a r...

Given E(X)=10, Var(X)=25 where X is a random variable and Y=aX-b is also a random variable with mean =0 and variance=1 , then a and b are

A

`a=2,b=1/5`

B

`a=1/5,b=2`

C

`a=5,b=1/2`

D

`a=1/2,b=5`

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b
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