[求助] GWD 4 数学Q11

lisese

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

答案是C....

根本不知道怎么做的。。。

请各位帮忙解释一下～～～拜谢～～～

sandy_phil

应该是0.8X0.8X0.2得到答案是0.128把。