SOLUTION: Quite urgent -Please help me solve s.d. of Y Question: If Z = X + Y and X and Y are independent, calculate the standard deviation of Y, sigma subscript Y . Please give your ans

SOLUTION: Quite urgent -Please help me solve s.d. of Y Question: If Z = X + Y and X and Y are independent, calculate the standard deviation of Y, sigma subscript Y . Please give your ans

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Question 974918: Quite urgent -Please help me solve s.d. of Y
Question:
If Z = X + Y and X and Y are independent, calculate the standard deviation of Y, sigma subscript Y . Please give your answer to 4 decimal places.
I understand that s.d z= square root s.d x + s.d. y but do not know how to work out just y?
Thank you

Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

You have

Square both sides and move things about:

I presuming from the way you worded the question that

and

are givens.

John

My calculator said it, I believe it, that settles it

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