【单选题】某人投资了三种股票,这三种股票的方差-协方差矩阵如下表,矩阵第(i,j)位置上的元素为股票i与j的协方差,已知此人投资这三种股票的比例分别为0.3,0.3.O.4,则该股票投资组合的风险是( D )。 A B C A 100 120 130 B 120 144 156 C 130 156 16...
【简答题】I have quite a small family. I live with my sister and my parents. My sister's name is ____ and she is 15 years old. She's a student. My mom's name is 2____ and my dad's name is 3____. Mom's a teacher...