我在概念上有些不太明白这些题,可否有牛牛给解答一下.感激万分!!
Q2:
On Saturday morning, Malachi will begin a camping vacation and he will return home at the end of the first day on which it rains. If on the first three days of the vacation the probability of rain on each day is 0.2, what is the probability that Malachi will return home at the end of the day on the following Monday?
A. 0.008
B. 0.128
C. 0.488
D. 0.512
E. 0.640
此题目同 FF-4-21
21、张三要去出游，但她会在下雨的第一天日终回家，已知她是星期六开始旅行的，施行头三天下雨的概率（each）分别是0.2（independent），问张三在星期一回家的概率。
Answer: (0.8)^2 * 0.2
问张三在星期一回家的概率,说明星期一这天下雨了，而星期六和星期日是不下雨的。
则所求的概率为0.8*0.8*0.2=0.128
| 欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/) | Powered by Discuz! 7.2 |