<p>设总体X<img src="https://learnfile.20230611.cn/learnAppQuestion/7b/d8/7bd8e53c602e18809a221424e287ac98.jpg" style="width: 100%;height: auto;">样本均值，<img src="https://learnfile.20230611.cn/learnAppQuestion/53/b5/53b5aa9989aea982bfb364120ad65fcc.jpg" st