统计与概率
已验证计算器，公式透明
Complementary Probability Calculator.
Calculates the probability that an event does NOT occur, given the probability that it does occur.
您的输入
工作原理
- 1
Enter the probability of the event occurring as a percentage.
- 2
Subtract that value from 100.
- 3
The result is the probability that the event does not occur.
100 - event_probability常见问题
What does complementary probability mean?
It is the probability that an event does not happen, equal to 1 minus the event probability.
Can I enter a probability greater than 100%?
No, probabilities must be between 0% and 100%.
工作原理
Calculates the probability that an event does NOT occur, given the probability that it does occur.
- Enter the probability of the event occurring as a percentage.
- Subtract that value from 100.
- The result is the probability that the event does not occur.
公式
此计算器背后的数学公式，供您核对结果。
Complementary rule
The probability of the complement is one minus the probability of the event.
Example:
Input: P(A) = 0.30
Calculation: 1 - 0.30
Result: 0.70
实际应用场景
此计算在日常生活中的应用。
Quality control
Estimate the chance a product is not defective given the defect rate.
Example: Defect rate 2% → 98% non-defective.
Risk assessment
Find the probability of no failure when failure probability is known.
Example: Failure 5% → 95% no failure.
提示与常见错误
Tips
- Always express probabilities as percentages or decimals consistently.
- The complement of an event includes all other possible outcomes.
- Check that your input is between 0 and 100.
Common Mistakes to Avoid
- Forgetting to subtract from 100 when using percentages.
- Using decimals instead of percentages without converting.
- Assuming complementary probability is the same as odds.
假设与限制
- Use the stated inputs and units.
- Results are estimates for planning and education.
- Check measurements and source data before making an important decision.