🎲 二项分布概率计算器Binomial Probability Calculator
计算 n 次独立试验中恰好、至多、至少成功 k 次的概率，以及期望和方差。Probability of exactly, at most and at least k successes in n trials, plus mean and variance.
使用说明与常见问题How-to & FAQ
「二项分布概率计算器」是什么？What is the Binomial Probability Calculator?
计算 n 次独立试验中恰好、至多、至少成功 k 次的概率，以及期望和方差。Probability of exactly, at most and at least k successes in n trials, plus mean and variance.
如何使用「二项分布概率计算器」？How do I use the Binomial Probability Calculator?
在「二项分布概率计算器」中，填写「试验次数 n」、「成功次数 k」、「成功概率 p」等参数，结果会随输入实时计算并显示在下方。In the Binomial Probability Calculator: Fill in "Trials n", "Successes k", "Probability p"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「二项分布概率计算器」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 Binomial Probability Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「二项分布概率计算器」免费吗？需要注册吗？Is the Binomial Probability Calculator free? Do I need an account?
「二项分布概率计算器」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 Binomial Probability 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.