有關statistic,probabilty
2012-10-24 7:24 am
suppose that , on average , 1 person in 1000 makes a numerical error in preparing his or her income tax return . if 10,000 forms are selected at random and examined , find the probability that 6 , 7 , or 8 of the forms contain an error .
回答 (2)
2012-10-24 5:00 pm
✔ 最佳答案
Using Poisson distribution with λ = 0.001 x 10000 = 10:P(6 error) = 106 x e-10/6!
P(7 error) = 107 x e-10/7!
P(8 error) = 108 x e-10/8!
So the required probability is:
e-10 (106/6! + 107/7! + 108/8!)
= 0.2657
參考: 原創答案
2012-10-26 11:10 pm
Can we use normal distribution?
收錄日期: 2021-04-13 19:04:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121023000051KK00800