下面函数中，可作为某随机变量分布函数的是__________________. - ①. F(x) = x + 1, x ∈ R
- ②. F(x) = {2, x > 0; 0, x ≤ 0}
- ③. F(x) = {1 - e^(-x), x > 0; 0, x ≤ 0}
- ④. F(x) = {cos(x), 0 ≤ x ≤ π; 0, x < 0}
- ⑤. F(x) = e^(-x), x ∈ R
- ⑥. F(x) = x^2 + 1, x ∈ R
- ⑦. F(x) = {sin(x), 0 ≤ x ≤ π; 0, x < 0}
- ⑧. F(x) = {x + 1, x > 0; 0, x ≤ 0}
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