• 2022-07-28
    ​设总体X服从N(0,1),[img=113x23]180318bef28473b.png[/img]是来自总体的简单随机样本,其样本均值为[img=15x22]180318befb13556.png[/img],样本方差为[img=19x22]180318bf0453dc9.png[/img],则( )​
    A: [img=93x27]180318bf0cd0359.png[/img]
    B: [img=97x27]180318bf152a1e0.png[/img]
    C: [img=173x27]180318bf1e9a281.png[/img]
    D: [img=95x27]180318bf27610c4.png[/img]