統計學卜瓦松分配怎麼求？
回答 (1)
2020-11-15 12:47 am
✔ 最佳答案
X～Poi(2).問:
(a) P[X = 5]
(b) P[X ≧ 5]
(c) P[X > 5]
P[X = 5] = 2^5e^(-2)/5! = 32e^(-2)/120 = (4/15)e^(-2)
P[X ≧ 5] = 1- P[X ≦ 4]
= 1 - e^(-2){1+2+2^2/2+2^3/6+2^4/24}
= 1 - 7e^(-2)
P[X > 5] = P[X ≧ 5] - P[X = 5]
= 1 - 7e^(-2) - (4/15)e^(-2)
= 1 - (109/15)e^(-2)
收錄日期: 2021-05-04 02:31:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20201114135041AAytHE2