🔔 正态分布计算器Normal Distribution Calculator
计算正态分布在区间 [a, b] 内的概率、累积概率，以及给定概率对应的分位数。Probability between a and b for a normal distribution, cumulative probabilities and inverse (quantile).
使用说明与常见问题How-to & FAQ
「正态分布计算器」是什么？What is the Normal Distribution Calculator tool?
计算正态分布在区间 [a, b] 内的概率、累积概率，以及给定概率对应的分位数。Probability between a and b for a normal distribution, cumulative probabilities and inverse (quantile).
如何使用「正态分布计算器」？How do I use the Normal Distribution Calculator tool?
在「正态分布计算器」中，填写「平均值 μ」、「标准差 σ」、「下限 a」、「上限 b」、「分位数概率 p」等参数，结果会随输入实时计算并显示在下方。In the Normal Distribution Calculator: Fill in "Mean μ", "Std dev σ", "Lower a", "Upper b", "Quantile p"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「正态分布计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Normal Distribution Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「正态分布计算器」免费吗？需要注册吗？Is the Normal Distribution Calculator free? Do I need an account?
「正态分布计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Normal Distribution Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.