设总体X 服从正态分布[img=65x27]1802fe3952e8027.png[/img],[img=113x23]1802fe3960cb0cd.png[/img]是来自总体X的样本，则 [img=124x52]1802fe396b0df46.png[/img].
举一反三
- 设总体X 服从正态分布[img=65x27]18033962a33b790.png[/img],[img=113x23]18033962b1331b4.png[/img]是来自总体X的样本，则 [img=124x52]18033962bcf17f3.png[/img].
- 设总体X 服从正态分布[img=65x27]1802f2c743f0a7f.png[/img],[img=113x23]1802f2c7519e713.png[/img]是来自总体X的样本，则 [img=124x52]1802f2c75b3b0c1.png[/img].
- 设总体X 服从正态分布[img=65x27]1802f291fa91596.png[/img],[img=113x23]1802f292034a0a7.png[/img]是来自总体X的样本，则 [img=124x52]1802f2920eac3c1.png[/img].
- 设总体X服从正态分布[img=65x27]1802f2921729533.png[/img]，[img=113x23]1802f2921fd4d2f.png[/img]是来自总体X的样本，则[img=108x52]1802f2922d6ac3a.png[/img]
- 设总体X服从正态分布[img=65x27]1802e8c46368f76.png[/img]，[img=113x23]1802e8c46fa8b2c.png[/img]是来自总体X的样本，则[img=108x52]1802e8c47cb0299.png[/img]