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Retries
the Following Table Contains the Probability Distribution for X

Question 113

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Retries
The following table contains the probability distribution for X = the number of retries necessary to successfully transmit a 1024K data package through a double satellite media.
x0123p(x)0.350.350.250.05\begin{array} { | c | c c c c | } \hline \boldsymbol { x } & 0 & 1 & 2 & 3 \\\hline \boldsymbol { p } ( \boldsymbol { x } ) & 0.35 & 0.35 & 0.25 & 0.05 \\\hline\end{array}
-If X and Y are two variables with σ\sigma x = 3.8, σ\sigma y = 4.2,and COV(X,Y)= -0.25,then V(X + Y)= 31.58.

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