题目
At a major broker-dealer, there occurs on average a high-frequency, low-severity (HFLS) operational loss five times per day. According to a Poisson distribution, on a given single day, what is the probability that at least one operational loss will occur?
选项
A.89.3%
B.91.3%
C.95.3%
D.99.3%
答案
D
解析
P(X>0) = 1 - P(X=0) = 1 -5^0 *e^(-5)/0! = 1 -e^(-5) = 99.33%P(X>0) = 1 - P(X=0) = 1 -5^0 *e^(-5)/0! = 1 -e^(-5) = 99.33%