Question 10 Chapter B-textbook, mini quiz question 10. Not yet answe'ed A bank operates both a drive-up facility and a walk-up window. On a randomly selected day, let X: the proportion of time that the drive-up facility is in use (at least one customer is being served or waiting to be served) Marked out of and Y=the proportion of time that the walkup window is in use. Suppose the joint probability density function of X and Y is given by 1.00 6 rrlag f(x,y)=7(x+y2), 05x51, DSySI question 5 The probability that neither facility is busy more than one-quarter of the time is Select one: 0 a. 0.67 o b. 0.0109 c) a. 0.0004 0 d. 0.101968 - Question 11 Let X, Y be two random variables with joint density Not yet answered f(x, y Marked out of 1.00 ). Flag question [ ( x - Hx ) ( V - My)f (x, y)dydx equals Select one or more: O a. always 1 O b. Cov(X, Y) O c. 0 if the random variables are independent O d. Var(X) Var(Y) Previous page Next pagQuestion 12 Not yet answered Marked out of 1.00 \\7 Flag question Consider the joint density function E(XY) equals Select one: o a. 3/12 0 b. 4/9 0 at 1/2 0 d' 7/3