(c) 不良率 ( Fraction Defective )：d 为样本中的不良个数，n 为样本数，所以， 其 不良率 为每个样本中的不良品个数，即 n d p 。
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... 馏分（蒸馏），分式，分数（数学） fraction 不良率（品管），瑕疵率 fraction defective 分别凝结 fractional condensation ...
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lot tolerance fraction defective 批容许废品率 ; 批容许不合格率
standard fraction defective 标准不良率
fraction defective chart 不良率管制图 ; 次品率图
critical fraction defective 临界不良率
mean fraction defective 平均不良率 ; 平均不合格品率
fraction-defective chart 微量不良率图
Improve existing products, fraction defective decrease more than 80% within one year.
改进现有产品，一年内质量不良率下降80%以上。
The results indicated that the Cd pollution condition was severe in the fishery products, which were increased year by year, and the fraction defective rate of other foods were degraded.
结果表明，水产品中镉污染严重，且有逐年升高的趋势，其他各类食品的超标率有逐年降低的趋势。
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