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
答案是 B
这道题居然原来都没有问过,可是我觉得好难呀,哪位同学能给我讲讲此题思路?谢谢 |