英语翻译内容：”选择预期收益率的概率（密度）函数：计算VaR,要求期望收益率（或资产的预期价格变动）的概率密度函数为已知

我靠,回答得不错呀,我幼儿园的,都不会出现那么多语法错误,有软件翻译的吧
看看我的
Choose expected rate of return of probability（density）function:
count VaR,require eather Expected rate of return (or assets of the expected price changes) of probability density function as known,or it can be derived from the known distribution Commonly used is the distribution of normal distribution. This assumption greatly simplifies the VaR heavy computation burden, for risk managers provides a powerful statistical tools. Using the normal distribution because almost all known inferential statistical method of starting point is normal hypothesis, it has had identification of the terminal theorem in the centre in theory