已知连续型随机变量<img src="https://zk.995w.com/lqwvjeImg/e3/e3fcd460164b6f59370a7df8fe126729.png" style="width:18px;height:17px;" >的概率密度<img src="https://zk.995w.com/lqwvjeImg/3a/3a59067c41986bf478ae08656965845d.png" style="font-size: 20px;" >，则K=（）<br>· <img src="https://zk.995w.com/lqwvjeImg/73/73497d50977469b0b4f92ee9741a2da3.png" <br>· <img src="https://zk.995w.com/lqwvjeImg/24/24dd18839fa7489eb9bbd4699e7686ac.png" <br>· <img src="https://zk.995w.com/lqwvjeImg/f0/f0a2e9d17370dc241f7417c7c42aec48.png" <br>·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1698485359817f7b56da7830f44ed929b2b484c87ded2image69.png"