尼克内姆 · 2019年11月06日
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
bounded from zero 不是说一定会大于0吗？？为啥不选B呢
NO.PZ2017092702000103问题如下 The lognormstribution is a more accurate mol for the stribution of stoprices ththe normstribution because stoprices are:A.symmetrical.B.unbounC.non-negative. C is correct. A lognormstributevariable ha lower bounof zero. The lognormstribution is also right skewe whiis a useful property in scribing 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。 用lognormal为什么不选a呢
NO.PZ2017092702000103 是不是老师讲到的国内股票有一个涨跌幅度的限制呀？
NO.PZ2017092702000103 unboun non-negative. C is correct. A lognormstributevariable ha lower bounof zero. The lognormstribution is also right skewe whiis a useful property in scribing asset prices为什么lognormal的取值范围和右偏,可以很好的衡量stoprice或asset price呢 谢谢
请问该怎么理解b c？
