A service facility operates with two service lines. The random variables X and Y are the proportions of the time that line 1 and line 2 are in use, respectively. The joint probability density function for (X,Y) is given below. Complete parts (a) through (d) below. 17 1 + 0≤x,y≤ 1, f(x,y) = 6 6 elsewhere

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Just need help with parts b - d

(b) It is of interest to know something about the proportion of Z=X+Y​, the sum of the two proportions. Find E(X+Y). Also find E(XY).

​(c) Find Var(X)​, Var(Y)​, Cov(X,Y),

(d) Find Var(X+Y).

A service facility operates with two service lines. The random variables X and Y are the proportions of the time that line 1 and line 2 are in use, respectively. The joint probability density function for
(X,Y) is given below. Complete parts (a) through (d) below.
17
1
+
0≤x,y≤ 1,
f(x,y) =
6
6
elsewhere
Transcribed Image Text:A service facility operates with two service lines. The random variables X and Y are the proportions of the time that line 1 and line 2 are in use, respectively. The joint probability density function for (X,Y) is given below. Complete parts (a) through (d) below. 17 1 + 0≤x,y≤ 1, f(x,y) = 6 6 elsewhere
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