From past experience, the probability that a new worker in a company can complete his daily tasks satisfactorily is 0.85 if he has undergone the company's in-house training and 0.35 if he has not undergone the training. If 87% of the new workers undergo the training, find the probability that the new worker of the company has not undergone training given that he is able to complete his tasks satisfactorily. Give your answer correct to four decimal places