• 2022-06-26
    设[img=172x25]180302c35b746e4.png[/img]为来自正态总体[img=54x25]180302c364a53c0.png[/img]的简单随机样本,[img=15x22]180302c36d4acf7.png[/img]为样本均值,[img=19x22]180302c37576740.png[/img]为样本方差,则( )
    A: [img=104x27]180302c37d98b57.png[/img]
    B: [img=97x27]180302c386b822a.png[/img]
    C: [img=158x48]180302c38f9d3e0.png[/img]
    D: [img=187x52]180302c39adaa75.png[/img]
  • 举一反三