随机变量<img src="https://static.zxtiku.com/wangke/imgs/topic/abfb3975e1021d655d806a068ed95998.jpg"/>和<img src="https://static.zxtiku.com/wangke/imgs/topic/ae513477b643a52d19d9e848cac908eb.jpg"/>的数学期望分别为-2和2，方差分别为1和4，且相关系数<img src="https://static.zxtiku.com/wangke/imgs/topic/2b056a20584003295c7762e45fb33e94.jpg"/>，则<img src="https://static.zxtiku.com/wangke/imgs/topic/d187429ef4a7178fc8dbbb8bdca1a785.jpg"/>，则<img src="https://static.zxtiku.com/wangke/imgs/topic/cd332e165bf057c737c80d28e8ead762.jpg"/>。（）