课后题

问题如下：

The lognormal distribution is a more accurate model for the distribution of stock prices than the normal distribution because stock prices are:

选项：

A.

symmetrical.

B.

unbounded.

C.

non-negative.

解释：

C is correct.

A lognormal distributed variable has a lower bound of zero. The lognormal distribution is also right skewed, which is a useful property in describing asset prices

对数正态分布变量的下限为零。 对数正态分布也是右偏的，这是描述资产价格的一个有用的特性。