这个讲解不明白 为什么不提一下均值和方差？还是这个题目问的根这个没关系？

c为什么不对

A distribution of asset returns that has a significantly higher probability of obtaining large losses is described as: A Thin tailed B Asymmetrical C Fat tailed D Symmetrical 老师好，这道题是不是应该选择B啊？

老师好，Positive-skewed distributions are those with a longer tail to the right side of the distribution, and the mass of left of the expected value is greater. 这句话后半句什么意思，正偏度不是应该右侧概率高吗？

按照视频答案 100*7%/2 * (90/180) = 1.75 不是1.88，请问1.88怎么算出来的？

老师好，E(X) = np = 5 × 0.6 = 3, V(X) = npq = 5 × 0.6 × 0.4 = 1.2是什么公式，为什么均值等于天数乘以概率，没看明白。

现在还不知道这个用计算机怎么按？

视频好像算得不对

Positive-skewed distributions exhibit: A a longer tail to the left of the distribution. B greater mass close to the expected value. C greater mass to the left of the expected value. D greater mass to the right of the expected value. 老师您好！为什么在均值左侧的大？我觉得均值两边应该面积是一样大的。

解题过程。