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X and Y are discrete random variables with the following joint distribution; e.g., P(X=4,Y=30)=0.07P(X=4, Y=30) = 0.07P(X=4,Y=30)=0.07.
What is the conditional standard deviation of Y given X=7X = 7X=7; i.e., Standard deviation(Y | X=7)?
A
10.3
B
14.7
C
21.2
D
29.4