(2)、若\(Y\)的分布函数为\(F(y)\),则\(F(2)\)的值为
A: \(\frac{2}{5}\)
B: \(\frac{19}{30}\)
C: \(\frac{11}{30}\)
D: \(\frac{4}{15}\)
A: \(\frac{2}{5}\)
B: \(\frac{19}{30}\)
C: \(\frac{11}{30}\)
D: \(\frac{4}{15}\)
举一反三
- (2)、若Y的分布函数为F(y),则F(2)的值为 A: 2/5 B: 19/30 C: 11/30 D: 4/15
- 已知函数由下列方程确定$x^2 - y^2=1 $,则$\frac{d^2 y}{d^2 x} =$( )。 A: $\frac{1}{y^2}$ B: $-\frac{1}{y^2}$ C: $-\frac{1}{y^3}$ D: $\frac{1}{y^3}$
- 已知离散随机变量\(X\)的分布列为<br/>(1)、\(Y=|X|\),则\(P(Y=1)\)的值为 A: \(\frac{7}{30}\) B: \(\frac{1}{15}\) C: \(\frac{1}{6}\) D: \(\frac{1}{5}\)
- 下列函数在点$(0,0)$的重极限存在的是 A: $f(x,y)=\frac{y^2}{x^2+y^2}$ B: $f(x,y)=(x+y)\sin\frac{1}{x}\sin\frac{1}{y}$ C: $f(x,y)=\frac{x^2y^2}{x^2y^2+(x-y)^2}$ D: $f(x,y)=\frac{x^2y^2}{x^3+y^3}$
- \(已知二元函数f(x,y)=\sin{x^2y},则\frac{\partial f}{\partial x}(1,\pi)=(\,)\) A: \(\frac{\pi}{2}\) B: \(2\pi\) C: \(-2\pi\) D: \(-\frac{\pi}{2}\)