mandan variabds Find (a) E(sx-y〉, (b) Var (SX-y), (c) Cov (3xtYN),a(x,5x-y
Hhm hour thas Find )E(SX-Y) (b) var (SX y), ( av(3x+Y, V)-)
QUESTION 9 Given E(X)=2 and Var(X)=4, let Y =5X-3. Find E(Y) Var(Y)
Var(Y) =y Var(X)=x Cov(X,Y) =z What is Cov(XY,XY)
6 Suppose that X and Y are random variables such that Var(X)-Var(Y)-2 and Cov(x,y)- 1. Find the value of Var(3.X-Y + 2)
X,Y, and Z are random variables. Var(X) = 2, Var(Y) = 1, Var(Z) = 5, Cov(X,Y) = 3, Cov(X, Z) = -2, Cov(Y,Z) = 7. Determine Var(3X – 2Y - 2+10)
6 Suppose that X and Y are random variables such that Var(X) Var(Y)-2 and Cov(x,y)- 1. Find the value of Var(3.X-Y+2)
5.8.6 otherwise. (a) Find the correlation rx.y (b) Find the covariance Cov(X,Y]. 5.8.6 The random variables X and Y have (b) Use part Cov oint PMF (c) Show tha Var[ (d) Combine Px,y and 5.8.10 Ran the joint PM PN,K (n, k) 0 0 Find (a) The expected values E[X] and EY, pected (b) The variances Var(X] and Var[Y],VarlK], E Find the m
6. Suppose that X and Y are random variables such that Var(X)=Var(y)-2 and Cov(x,y)-1. the value of Var(ax-y-2). Find
Suppose (X,Y) follows a trinomial distribution (5, 1/3, 1/4). a. Find E(X) b. Find E(Y) c. Find Var(X) d. Find Var(Y) e. Find Cov (X,Y) f. Find p (correlation coefficient)
12y2 for 0 <y sxs1 f(x,y) = 0 0. W. 4x3 for 0 SX S1 (12y2(1 - y) for 0 sys1 fx(x) = -2230 {*. and fr(y) = 0.w. 0. W. 1 25 2 Also, Var(X) 75 and Var(Y) (a) Find E(XY). (b) Find Cov(X,Y). (c) Find Var(X-Y).