3.(3分) 设<img src="https://static.zxtiku.com/wangke/imgs/topic/c67f61e0112c93d0bf2716052bc0491d.jpg"/>，且<img src="https://static.zxtiku.com/wangke/imgs/topic/50540efc3b3b37319897d7277162ace2.jpg"/>为标椎正态分布的分布函数，则<img src="https://static.zxtiku.com/wangke/imgs/topic/ec96f99c9f17eb7209fe7bcc2e7af21b.jpg"/>（）<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/5d7e4244b8ccec11a93b65d61473b8d8.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/6f9c8f359997f9700ee03f0d7c4e8d0a.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/c3a06d3e9e5875474474b4724afbd0e2.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/0d772dbceb54b37d7b9f30955468a8b5.jpg"/>