Six high-power drills are tested for 150 hours each. One failed at 45 hours; all others completed the test. Calculate FR(%), FR(N) and MTBF.

High-Power Drills

Drilling machines with high output power, designed for heavy-duty tasks and capable of penetrating hard materials.

FR(%)

Failure Rate (Percent), a measure often used in reliability engineering to indicate the likelihood of failure per unit of time.

MTBF

Mean Time Between Failures, a reliability metric that measures the average time between failures of a system or component.