设随机变量[tex=2.786x1.286]AG5D6gU/evQZlfwisXgzYw==[/tex]的联合密度函数为[p=align:center][tex=12.643x3.643]lJblPB9MNpIrc6Sy3BdmFblHfEN66pBcu0QuHw83KIQ3cdudKq3vlH+DZ0H6zdGeW8uEDxfKFdi4ReFZRbtgP/bVRWUbaN7hKPugDB3/GcI=[/tex]求 [tex=9.429x1.357]3mx/zSqcilpFkVvGSt6vqzwBxGF2wXRFoaQYFr/1xmy0RxXWtAvv9CRYSZFadaLG[/tex]
举一反三
- 设随机变量[tex=2.786x1.286]AG5D6gU/evQZlfwisXgzYw==[/tex]的联合密度函数为[p=align:center][tex=14.143x3.643]lJblPB9MNpIrc6Sy3BdmFUO0inJrAJ+S9rWSLKaoQEwZArhdhamjfsTonNCB7tgOdWR/hKgLvbpk95zxo1Qj2FZaPRkK91X1tSDU6k59qEM=[/tex]求 [tex=4.286x1.357]n/CQ18GUhnUVt9w6H4KtW2FiusirI7U4IIl2+H1BcqE=[/tex] .
- 设二维随机变量[tex=2.786x1.286]AG5D6gU/evQZlfwisXgzYw==[/tex]的联合密度函数为[p=align:center][tex=18.786x3.643]lJblPB9MNpIrc6Sy3BdmFTulnCSmzPh4E9xtF58toUCeK0TiyLWgTM9bJi3NqT2iMczjkKX1Q/Fre0z38dI9idnd/d01g0kUlwKQnBjmruYCuWyAPx5D0Mn+UYGqiADP[/tex]求 [tex=4.929x1.286]bstb6Acm/GnARrPc8f1uPw==[/tex] 的密度函数.
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为？ A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']
- 设二维随机变量(X,Y)的联合分布列为 XY -1 0 1 -1 1 1/6 1/9 2/9 1/3 0 1/6则P{XY=1}为( ) A: 0 B: 1/6 C: 1/3 D: 2/3