4. Given X1Geo(0.5),X2Geo(0.25),X3Geo(0.25),X4Geo(0.2),X5Geo(0.1) where xi=1,2,, (1) Find P(X1=4X1=2) ? (2) Find P(X14X12) ? (homework 3/20 revised) (3) Find P(X1>4X1>2) ? (homework 3/20 revised) (4) Find P(X33) ? (5) Find the Var(X5) of r.v. X5 (6) Find E(Y) and Y=X1+X2+X3+X4+X5.