Which is correct in the following formula?
A: [img=295x25]1803a1c0787d44e.png[/img]
B: [img=291x25]1803a1c08400e18.png[/img]
C: [img=291x25]1803a1c08ecf5b4.png[/img]
D: [img=287x25]1803a1c0976d631.png[/img]
A: [img=295x25]1803a1c0787d44e.png[/img]
B: [img=291x25]1803a1c08400e18.png[/img]
C: [img=291x25]1803a1c08ecf5b4.png[/img]
D: [img=287x25]1803a1c0976d631.png[/img]
举一反三
- Which is correct in the following formula? A: [img=295x25]1803a1c1460a5c9.png[/img] B: [img=291x25]1803a1c1506a2e1.png[/img] C: [img=291x25]1803a1c15b2965e.png[/img] D: [img=287x25]1803a1c16805fa1.png[/img]
- 随机变量 X 服从均匀分布[img=296x96]17de89393460b92.png[/img]则D(X)=( ). A: 4.5 B: 25/12 C: 1/5 D: 1
- 设随机变量X的概率密度是偶函数，D(X)=1。已知切比雪夫不等式估计得[img=138x25]18034e923999577.png[/img]，则常数[img=27x14]18034e9242ce462.png[/img]___________。 A: 1 B: 5 C: 0.96 D: 25
- 1.设随机变量X的密度为[img=186x61]18034ea953ec9dd.png[/img]则常数A=________，概率[img=146x25]18034ea95d30d08.png[/img]__________. A: A=2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] B: A=-2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] C: A=2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img] D: A=-2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img]
- For a stationary AR(1) model, [img=114x22]180300ca641c929.png[/img], where [img=112x25]180300ca6bdc586.png[/img]. Then [img=73x25]180300ca73e9f53.png[/img] A: 5 B: 1.25 C: 25/16 D: 25/9