Question# 1 [12 points]: A particular fast-food outlet is interesting the joint behavior of the random variables X, the total time between a customer's arrival at the store and his leaving the service window and X2 the time that the customer waits in line, we must have X,2 X2 The relative frequency distribution of observed values of X, and X2 can be modeled by the probability density function ** SX1 0 elsewhere (Measurements are in hundreds of hours) f(x1-x) = 0 x 5 x < so Va. Find P (X2, X, >1). 10. Find the marginal density functions for of X, and X2.