A particle is described by the wavefunction [img=125x28]180380acf324ab6.png[/img] . The probability of finding it anywhere on the positive x axis (i.e., on the interval 0A: [img=9x43]180380acfada5ef.png[/img]
B: [img=25x47]180380ad0313e37.png[/img]
C: [img=9x43]180380ad0b681d3.png[/img]
D: it depends on the value of [img=11x19]180380ad142db4c.png[/img]
B: [img=25x47]180380ad0313e37.png[/img]
C: [img=9x43]180380ad0b681d3.png[/img]
D: it depends on the value of [img=11x19]180380ad142db4c.png[/img]
举一反三
- 设X服从[0,2]上的均匀分布,则D(X)= A: [img=9x43]1803da3ff5384e2.png[/img] B: [img=9x43]1803da3ffe176cc.png[/img] C: [img=9x43]1803da400607ad3.png[/img] D: [img=18x43]1803da400e6fff0.png[/img]
- 设随机变量X服从参数为[img=11x19]1803209e6cc6c2b.png[/img]的指数分布,并且X的数学期望为[img=62x43]1803209e757343f.png[/img],则X的方差[img=49x19]1803209e7d8a04f.png[/img]( ) A: [img=9x43]1803209e85e3717.png[/img] B: [img=9x43]1803209e8d704eb.png[/img] C: 2 D: 4
- 设随机变量X服从参数为[img=11x19]1803209088f48d0.png[/img]的指数分布,并且X的数学期望为[img=62x43]1803209091842ba.png[/img],则X的方差[img=49x19]180320909a600ba.png[/img]( ) A: [img=9x43]18032090a2528d5.png[/img] B: [img=9x43]18032090ab15056.png[/img] C: 2 D: 4
- 设随机变量X服从参数为[img=11x19]1803214d70a19bc.png[/img]的指数分布,并且X的数学期望为[img=62x43]1803214d79828bb.png[/img],则X的方差[img=49x19]1803214d82a4360.png[/img]( ) A: [img=9x43]1803214d8af13f1.png[/img] B: [img=9x43]1803214d92fa917.png[/img] C: 2 D: 4
- 设随机变量X服从参数为[img=11x19]18033f9f90cfbc7.png[/img]([img=44x20]18033f9f994f61b.png[/img])的泊松分布,且P(X=1)=P(X=2),则D(X+1)=( ) A: 2 B: 3 C: [img=9x43]18033f9fa0d85e1.png[/img] D: [img=9x43]18033f9fa8c26fe.png[/img]