noun
failure rate
Technical term used in engineering, reliability analysis, and quality control to express the proportion of items that fail within a given period.
この部品の故障率は非常に低い。
The failure rate of this component is very low.
故障率を下げるために設計を見直した。
We reviewed the design to reduce the failure rate.
不良率 refers to the defect rate in manufacturing (proportion of defective items), whereas 故障率 focuses on failures over time during operation.
Compound of 故障 (failure, breakdown) and 率 (rate, proportion).