设两个相互独立的随机变量<img src="https://zk.995w.com/lqwvjeImg/77/7720e81f571f864b405aa5423a4831c2.png" style="font-size: 14px;" >分别服从正态分布<img src="https://zk.995w.com/lqwvjeImg/4f/4f02eb07ebf3ed2ea03409519879c7dc.png" style="width: 48px; height: 21px;" >和<img src="https://zk.995w.com/lqwvjeImg/5b/5b92eab86279a6ba84e93934a24986b9.png" style="width: 45px; height: 21px;" >则<img src="https://zk.995w.com/lqwvjeImg/8f/8f2a92c75b0103d8886357e183d48bb9.png" style="width: 118px; height: 41px;" >。<br>·正确<br>·错误