这个计算要掌握么

问题如下：

In the last ten years, a bank has had losses (in millions of euros) of 4, 6, 12, 50, 70, 140, and 280. What is the bank’s loss component under the SMA?

选项：

解释：

In millions of euros, total losses for ten years are 562, losses greater than ten are 552, and losses greater than 100 are 420. The loss component is

7×56.2 + 7×55.2 + 5×42.0 = 989.8

题目问：在过去的10年里，一家银行的损失是4m，6m，12m，50m，70m，140m和280m。求SMA方法下银行损失的组成是什么？

10年总共的损失是562，每年平均56.2；大于10m的损失一共是552，平均每年是55.2；大于100m的损失是420，每年平均是42。

loss component=7×56.2 + 7×55.2 + 5×42.0 = 989.8