Robert Klassan Manufacturing, a medical equipment manufacturer, subjected 100 pacemakers to 5,000 hours of testing. Halfway through the testing, 5 pacemakers failed. What was the failure rate in terms of the following: a) Percentage of failures? b) Number of failures per unit-hour? c) Number of failures per unit-year (24 hour day / 356 days per year)? d) If 1,100 people receive pacemaker implants, how many units can we expect to fail during the following year?