A restaurant serves three fixed-price dinners costing $12,515 and 520. For randomly selected couple dining at this restaurant: Let X = the cost of the first person' $ dinner and Y the cost of the second person dinner: The joint probability distribution of X and Y is given in the following table:
20 ,05 J05 3 05 110 3 20
(a) What is the probability that the second person dinner is at least as expensive as the first person dinner?