The average accident on a certain road section is at 2.4 per day, what is the probability that there will be 12 accidents in a week? A bus company operates both a walk-in and online booking to accommodate their passengers. On a random day, let X and Y be the events that both walk-in and online bookings are in use, respectively, and suppose that their joint density function is given by the equation before. What is the marginal PDF of X and Y? f(x,y) = = (x+2y), 0 x 1,0 y 1 elsewhere