概率高手请进,关于概率的问题~

2025-01-02 20:20:16
推荐回答(2个)
回答1:

你好!

用X表示出现次数

P(X=0) = 0.5^5 = 1/32
P(X=1) = C(5,1) * 0.5 * 0.5^4 = 5/32
P(X=2) = C(5,2) * 0.5² * 0.5³ = 5/16
P(X=3) = C(5,3) * 0.5³ * 0.5² = 5/16
P(X=4) = C(5,4) * 0.5⁴ * 0.5 = 5/32
P(X=5) = 0.5^5 = 1/32

至少出现一次的概率
P(X ≥ 1) = 1 - P(X=0) = 31/32

回答2:

二项分布