NO.PZ2024120401000059
问题如下：
The probability distribution of a discrete random variable f(X=xᵢ) satisfies:
选项：
A.f(X=xᵢ) = P(X = xᵢ), i = 1,2,3... and f(X) = 0, x ≠ xᵢ, 0 ≤ f(xᵢ) ≤ 1, ∑f(xᵢ) = 1
B.f(X=xᵢ) = P(X > xᵢ), i = 1,2,3... and f(X) = 0, x ≠ xᵢ, 0 ≤ f(xᵢ) ≤ 1, ∑f(xᵢ) = 1
C. f(X=xᵢ) = P(X < xᵢ), i = 1,2,3... and f(X) = 0, x ≠ xᵢ, 0 ≤ f(xᵢ) ≤ 1, ∑f(xᵢ) = 1 D.f(X=xᵢ) = P(X ≤ xᵢ), i = 1,2,3... and f(X) = 0, x ≠ xᵢ, 0 ≤ f(xᵢ) ≤ 1, ∑f(xᵢ) = 1解释：
不理解题目意思，这个题目应该怎么分析，离散变量的概念？
