问题如下：
Anna, FRM, an analyst in Zack Corporation, is determining the value at risk (VaR) for the corporation's profit/loss distribution. The distribution is assumed to be normally distributed with an annual mean of $2 million and a standard deviation of $0.5 million. What is the VaR with a 99% confidence level if a parametric approach is applied?
选项：
A.$0.01 million.
B.$0.33 million.
C.$1.33 million.
D.$2.33 million.
解释：
B is correct.
考点：Parametric Estimation Approaches
解析：
The population mean and standard deviations are unknown; therefore, the standard normal z-value of 2.33 is used for a 99% confidence level.
VaR(1%) = -2.0 million + ($1 million)(2.33) = -2.0 million + 2.33 million =0.33 million.
VaR(1%) = -2.0 million + ($1 million)(2.33) = -2.0 million + 2.33 million =0.33 million.
老师，请问题干中standard deviation不是0.5么？为什么答案中是1？
