如何计算Binomial Distribution
learn.whatIsHeading
The binomial distribution models the number of successes in n independent trials with fixed probability p per trial. P(X=k) = C(n,k) × pᵏ × (1−p)^(n−k). Mean = np; variance = np(1−p).
分步指南
- 1P(X=k) = C(n,k) × pᵏ × (1−p)^(n−k)
- 2C(n,k) = n! / (k! × (n−k)!) — combinations
- 3Applies when: fixed n, binary outcome, constant p, independent trials
例题解析
输入
Coin flip n=10 · P(exactly 5 heads)
结果
P = C(10,5)×0.5¹⁰ = 24.6%
Most likely single outcome, but still only ~25%
准备好计算了吗？尝试免费的 Binomial Distribution 计算器
自己尝试一下 →