Failure Rate
Percentage of products/services failing to meet standards.
Formula
Failure Rate = (Number of Failures / Total Units Tested) × 100
Real World
Boeing's 737 MAX had a catastrophic failure rate stemming from MCAS software faults, resulting in two crashes, a worldwide fleet grounding, and billions in compensation costs.
Exam Focus
In calculation questions, show the formula first, substitute clearly, and state the unit (%) — method marks are available even if the final answer is wrong.
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