• 2022-05-27
    设总体[img=15x19]180302c37f62dbe.png[/img]服从参数为[img=68x25]180302c38865cd5.png[/img]的泊松分布,[img=172x25]180302c39053677.png[/img]是来自于总体的简单随机样本,记[img=106x60]180302c398c4693.png[/img][img=195x63]180302c3a4f33f0.png[/img]则( )
    A: [img=240x25]180302c3ac71512.png[/img]
    B: [img=240x25]180302c3b488d8d.png[/img]
    C: [img=240x25]180302c3c20b399.png[/img]
    D: [img=240x25]180302c3cb3b414.png[/img]