Among 8834 heart pacemakers, 504 were found to be defective. If five (5) pacemakers are selected, what is the probability that at least one is defective? Remember 3 significant figures for probability. (4 marks)


Using the same sample of pacemakers, where among 8834 heart pacemakers, 504 were found to be defective, what is the probability of selecting three defective pacemakers without replacement? Remember 3 significant figures for probabilit