1. The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC Electric Motor Company designed an experiment where 11 motors were ran continuously for 8000 hours or until failure. Of the 11 motors that were tested, only 1 failed at 4270 hours. The remaining 10 motors were operational throughout the experiment. When the motor failed it was replaced. Determine the mean life. Assume that there is a constant failure rate.

2. The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC Electric Motor Company designed an experiment where 5 motors were ran continuously until failure. The five failures occurred at 1050, 8155, 9016, 9051, and 9591 hours. Determine the failure rate.

3. Determine the failure rate for an item that has the test of 10 items terminated at the end of 20 hours. Five of the items failed after 2, 4, 8, 10, and 11 hours respectively. Five items are still operating at the end of 22 hours. The items were not replaced.