成功率 = 99.9% → 失敗率 = 0.1% = 0.001。

Thu, 30 Apr 2026 13:24:17 +0000

The Power of Precision: Understanding 99.9% Success Rate and 0.1% Failure Rate in Critical Applications When evaluating performance in business, technology, medicine, or personal goals, precision in measurement is key. One of the most impactful expressions in data analysis is 99.9% success rate, equivalent to 0.1% failure rate — or, mathematically, 0.001. This elegant ratio represents excellence, reliability, and trustworthiness in almost any field. But what truly does 99.9% success mean, and why does the 0.1% failure rate matter so much? ### What Does 99.9% Success Rate Really Mean? A success rate of 99.9% (or 0.999) indicates that out of every 1,000 attempts, nearly all 999 succeed. For example: