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标题: 求问GWD一题 [打印本页]

作者: yidiyuehans    时间: 2011-2-22 20:48     标题: 求问GWD一题

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
ANSWER: B

作者: xiexiang    时间: 2011-2-23 06:57

0.8×0.8×0.2
作者: yidiyuehans    时间: 2011-2-23 20:28

为什么是这个式子呢,请大侠解释一下咯
作者: yidiyuehans    时间: 2011-2-25 21:03

谢谢大侠,我懂了




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