📐 Z 分数计算器Z-Score Calculator
根据数值、平均值和标准差计算 Z 分数，以及对应的百分位和左右尾概率。Z-score from value, mean and standard deviation, with percentile and tail probabilities.
使用说明与常见问题How-to & FAQ
「Z 分数计算器」是什么？What is the Z-Score Calculator tool?
根据数值、平均值和标准差计算 Z 分数，以及对应的百分位和左右尾概率。Z-score from value, mean and standard deviation, with percentile and tail probabilities.
如何使用「Z 分数计算器」？How do I use the Z-Score Calculator tool?
在「Z 分数计算器」中，填写「数值 x」、「平均值 μ」、「标准差 σ」等参数，结果会随输入实时计算并显示在下方。In the Z-Score Calculator: Fill in "Value x", "Mean μ", "Std dev σ"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「Z 分数计算器」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 Z-Score Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「Z 分数计算器」免费吗？需要注册吗？Is the Z-Score Calculator free? Do I need an account?
「Z 分数计算器」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 Z-Score 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.