设随机变量X的概率密度函数为则概率 - 查题网

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成人高等教育 / 经济数学

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设随机变量X的概率密度函数为 $p(x)=\left\{ \begin{ matrix } 0,\quad x\le 0; \\ \lambda { e }^{ -\lambda x },\quad x>0， \end{ matrix } \right$ 则概率 $P(X\ge 1)=(\quad \quad \quad \quad )$ ${ e }^{ \lambda }$

A、
${ e }^{ \lambda }$
B、
${ e }^{ -\lambda }$
C、
${ 1-e }^{ \lambda }$
D、
${ 1-e }^{ -\lambda }$

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经济数学

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