• 2022-06-15
    1803da219778bde.png是来自总体[img=109x27]1803da21a0868f0.png[/img]的样本,下列统计量中作为总体均值[img=11x18]1803da21a9d2ed1.png[/img]的估计量最有效的是()
    A: [img=195x43]1803da21b272d78.png[/img]
    B: [img=177x43]1803da21bbf0407.png[/img]
    C: [img=195x43]1803da21c8f39db.png[/img]
    D: [img=195x43]1803da21d140886.png[/img]
  • 举一反三