• 2022-06-19
    设随机变量X的密度函数为[img=157x76]1803da2a5f5da91.png[/img],则[img=126x25]1803da2a688542e.png[/img]
    A: 0.75
    B: 0.875
    C: [img=114x51]1803da2a71a5d9c.png[/img]
    D: [img=114x51]1803da2a7a85767.png[/img]