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 distributions have outcomes that cannot be positive
解释：
B is correct.
The probability of a lognormally distributed variable is always greater than or equal to 0.
C选项哪里不对呢？outcome can not be less than zero可以转述为是positive的吗？还是说positive只能用于形容分布是左偏还是右偏？
