标题:
[求助]一道概率题
[打印本页]
作者:
gmataren
时间:
2009-2-14 09:18
标题:
[求助]一道概率题
If the probability of rain on any given day in city X is 50%, what is the probability that it rains on exactly 3 days in a 5-day period?
作者:
丁香花儿
时间:
2009-2-14 18:11
做出来了,是C(5,3)*(.5)3*(1-.5)2=5/16
作者:
mandyuuqq
时间:
2009-2-15 09:37
 
=C53(1/2)^3(1/2)^2
作者:
tomrchu
时间:
2009-2-18 19:21
同意~
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