A medical insurance company has determined that in a given year that an insurance policy holder has a 30% chance of having at least one emergency room visit, and a 15% chance of having at least one hospitalization. It has also determined that a policy holder has a 6% chance of having at least one emergency room visit and at least one hospitalization, Using the above information, given that a policy holder has at least one emergency room visit, find the probability that they have at least one hospitalization