Let X and Y be jointly continuous random variables with joint density fX, Y px, yq " # a px ` yq e ´px`yq 0 ă x ă 8, 0 ă y ă 8 0 otherwise (a) Find the constant a. (Yes, you will need integration by parts.) (b) Set up the integral you would use to calculate Pp2X ă Y q. Make sure to clearly indicate the bounds on the integral. You do not need to evaluate the integral.