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

Algebra ->  Probability-and-statistics -> 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      Log On


   

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) About Me  (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