17. Suppose X has CDFF(x)=1x21 for x1 (and 0 elsewhere). (a) Show F is a valid CDF. Ans: F is 0 to the left, F approaches 1 to the right, and F never decreases left to right (b) Find P(2X3) Ans: 0.139889 (c) Find the 95th percentile of X. Ans: 4.472136 (d) Find E(X). Ans: 2.0.