From the 457 business graduates of a university, 404 graduates consider to work after they have completed their studies and 88 graduates consider to further their studies at the postgraduate level. 45 of the graduates consider to work while continue pursing their postgraduate studies at the same time. Find the probability that a graduate who is selected randomly either work after he has completed his studies or he continue further his studies at the postgraduate level. Give your answer correct to four decimal places