(b) [12 pts] What is the prior probability (i.c., before we search for previous computer related purchases and before we verify whether it is a foreign and/or an internet purchase) that the current transaction is a fraud? What is the probability that the current transaction is a fraud once we have verified that it is a foreign transaction, but not an internet purchase and that the card holder purchased computer related accessories in the past week? What to hand in: Indicate what queries (i.c., Pr(variables evidence)) you used to compute those prob- abilities. Whether you answer the queries by hand or using the code you wrote for Question 1, provide a printout of the factors computed at each step of variable climination (as done in the lecture slides). Use the following variable ordering when summing out variales in variable climination: Trav, FP, Fraud, IP, OC, CRP. Note that a maximum of two thirds of the marks are carned if you answer correctly the question by doing the computations by hand instead of using your program