NO.PZ2018062016000083
问题如下:
The stock of AAA company has a 30% probability to rise every year, assume that every annual trial is independent from each other. If the stock meets the goal of rising more than 1 time in the next 3 years, what is the probability that it fails to meet the goal?
选项:
A. 0.343
B. 0.216
C. 0.784
解释:
C is correct. Based on the corresponding formula:
, n = 3 and p = 0.30.
The required probability is: p(1) + p(0) = 0.441 + 0.343 = 0.784
目标是大于等于1次,fail完成目标就应该是小于0次,就应该只计算p(0)的概率啊