新人求大神指教该如何解答

yolanda18

On Satuiday 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 pribability 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

amberhe77

是B吗？

杉木

Sat: Not rainy Prob=0.8
Sun: Not rainy Prob=0.8
Mon: Rainy Prob=0.2

0.8*0.8*0.2=0.128
Ans: B