问题如下：
Given a discrete random variable Y, the set of all the possible Y value is Y = {16,25,37,42}. Which of the following is most likely to be the probability function of Y, f(y), g(y), or h (y) ?
选项：
A.f(y).
B.g(y).
C.h(y)
解释：
B is correct. For discrete random variables, the probability function must meet the requirements that 0≤ p(y)≤1 and ∑ p(y)=1.
Considering g(y): 0.56+0.14+0.12+0.18=1. f(y) and h (y) don't meet the requirement, so g(y) is the most appropriate option.
离散随机变量每一个数值取到的概率不是想等的吗？？怎么会出现概率还不一样呢？题目没有答案吧
