NO.PZ2019052001000029
问题如下：
Which of the following is correct when modeling risk frequency?
选项：
A.It usually uses a Poisson distribution.
B.Time-weighted loss number is used when calculating frequency
C.It usually assumes that risks are highly correlated through time to time.
D.It usually assumes risk frequency and severity are highly correlated.
解释：
A is correct.
考点：risk frequency and severity
解析：计算风险频率时一般使用泊松分布，通过调节λ来完善损失数据的准确性。
B选项只是把损失数字按照时间进行权重调整，和frequency无关。
C选项泊松的假设是时间与时间之间相互独立（虽然与现实不符）。
回答楼上同学的没看懂呀。。。要么。。。展开说说
我除了看出来A是对的，BCD感觉都没学过哈哈哈哈（莫不都是一级的知识点0.o）
节日快乐hhh~
