### Random Variables

Two different problems below: #1.) The following is the joint density for two random variables, X1 and X2: f(X1, X2): {3X1 for 0<=X2<=X1<=1 0 elsewhere Find P(0.2<=X2<=0.4) Which of the following answers: a.) 0.3750 b.) 0.2720 c.) 0.1800 d.) 0.3(1- X