In a class of 250 graduating students, 50 have jobs waiting,10 are going to medical university, 20 are going to law university and 80 are going to various other kinds of post-graduate courses. Assume that remaining students have not completed their degree. If one graduate is selected at random, (i) Find the probability that the student is going to post-graduate courses. (ii) Estimate the probability that the student is going to medical university? (iii) What is the probability that the selected student is a failed student or a job waiting student?