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Suechen · 2020年03月20日

问一道题:NO.PZ2015120604000101

问题如下:

Which of the following statements most accurately describe a lognormal distribution?

选项:

A.

The mean of lognormal distribution equals the mode of lognormal distribution.

B.

The Lognormal distribution's outcome can not be less than zero.

C.

Lognormal distribution's probability of a positive value is less than 30%.

解释:

B is correct.

The probability of a lognormally distributed variable is always greater than or equal to 0.

请问C为什么是错的,因为lognormal拟合价格,所以只能是价格数字吗

1 个答案

星星_品职助教 · 2020年03月20日

同学你好,

C选项错误的原因是lognormal分布的X取值全部为正数,而不是小于30%