NO.PZ2017092702000066
问题如下：
Which of the following best describes how an analyst would estimate the expected value of a firm under the scenarios of bankruptcy and survivorship? The analyst would use:
选项：
A.
the addition rule.
B.
conditional expected values.
C.
the total probability rule for expected value.
解释：
C is correct.
The total probability rule for expected value is used to estimate an expected value based on mutually exclusive and exhaustive scenarios.
本题涉及如果未来只有破产和不破产这两种情况下，如何计算公司的expected value。那么全概率公式来解决就即可。
请分别解释下a和为啥错
