Robert Klassan Manufacturing, a medical equipment manufacturer, subjected 100 heart pacemakers to 5,000 hours of testing. Half way 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? d. If 1,000 people receive pacemaker implants, how many units can we expect to fail during the following year?