A particular medical procedure can be performed by either putting the patient under general anesthesia or by using a local anesthesia. Suppose 65% of these procedures use general anesthesia and 35% use local anesthesia. If the procedure is performed using general anesthesia, there is an 80% success rate. If the procedure is performed using a local anesthesia, there is a 70% success rate. a) What is the success rate for this procedure? b) If a patient's procedure was successful, what is the probability local anesthesia was used?