X |
1 |
2 |
3 |
4 |
P |
0.2 |
0.3 |
a |
0.4 |
X |
-1 |
0 |
1 |
2 |
P |
0.2 |
0.1 |
a |
0.3 |
X |
1 |
2 |
3 |
P |
0.2 |
a |
0.5 |
求常数a的值; |
X |
-1 |
0 |
1 |
2 |
3 |
P |
0.2 |
0.1 |
0.3 |
a |
0.3 |
设随机变量Z的分布列为: X: 0 1 2 3 4 P: 0.5 0.2 0.1 0.15 0.05 则 |
X | 1 | 2 | 3 |
P | 0.2 | a | 0.5 |
X | 1 | 2 | 3 |
P | 0.2 | a | 0.5 |
X | -1 | 0 | 1 | 2 |
P | 0.2 | 0.1 | a | 0.3 |
X | -1 | 0 | 1 | 2 |
P | 0.1 | 0.3 | 0.2 | 0.4 |
X | 1 | 2 | 3 | 4 |
P | 0.2 | 0.3 | a | 0.4 |
X | -1 | 0 | 1 | 2 | 3 |
P | 0.2 | 0.1 | 0.3 | a | 0.3 |
设随机变量X在区间(0,1)内服从均匀分布,在X=x(0<x<1)的条件下,随机变量Y在区间(0,x)内服从均匀分布,求:
(Ⅰ)随机变量X和Y的联合概率密度;
(Ⅱ)Y的概率密度;
(Ⅲ)概率PX+Y>1.
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