A hospital made 225 medication errors last year. Of these errors, 30 percent were errors with the prescription while 70 percent were errors made while dispensing the medication. The hospital admitted 8465 patients last year, and the patients received an average of 4.8 prescriptions per hospital stay. Medications are dispensed at the time they are needed, and each medication is dispensed four times per day on average. The average patient stay at the hospital is 3.5 days. Compute the DPMO and process sigma level for the patient medicine process. What assumptions, if any, were needed to calculate the DPMO?