随机变量X只能取-1,0,1,2四个数值,其相应的概率依次为[img=17x43]18034eb58a25bf3.png[/img],[img=17x43]18034eb592c241d.png[/img],[img=17x43]18034eb59be08cb.png[/img],[img=26x43]18034eb5a4b10e3.png[/img],则c=____.
A: 0.25
B: 0.5
C: 0.75
D: 1
A: 0.25
B: 0.5
C: 0.75
D: 1
举一反三
- 随机变量X只能取-1,0,1,2四个数值,其相应的概率依次为[img=17x43]18034eb70726e46.png[/img],[img=17x43]18034eb7105733e.png[/img],[img=17x43]18034eb719197bd.png[/img],[img=26x43]18034eb7210d9d7.png[/img],则c=____. A: 0.25 B: 0.5 C: 0.75 D: 1
- 随机变量X只能取-1,0,1,2四个数值,其相应的概率依次为[img=17x43]18034eb88980f4c.png[/img],[img=17x43]18034eb8916420c.png[/img],[img=17x43]18034eb899f8be5.png[/img],[img=17x43]18034eb8a2978f5.png[/img],则c=________. A: 0.25 B: 0.5 C: 1 D: 2
- 随机变量X只能取-1,0,1,2四个数值,其相应的概率依次为[img=17x43]18034eb50252207.png[/img],[img=17x43]18034eb50a7551a.png[/img],[img=17x43]18034eb512a3737.png[/img],[img=26x43]18034eb51bd2952.png[/img],则c=____.
- 随机变量[img=8x23]18033db036b4873.png[/img]只能取-1,0,1,2四个数值,其相应的概率依次为[img=17x43]18033db03e9ebb9.png[/img],[img=17x43]18033db04791229.png[/img],[img=17x43]18033db050bf799.png[/img],[img=26x43]18033db058763eb.png[/img],则c=____.
- 设随机变量X的分布律为 X 1 2 3 p 0.5 c 0.25 则常数c=( ) 未知类型:{'options': ['0', ' 1', ' [img=14x43]17e0aa2da8f8c1d.png[/img]', ' [img=26x43]17e0aa2db2c725b.png[/img]'], 'type': 102}