Question
The cumulative distribution function (c.d.f.) of a continuous random variable $X$ is denoted by $F$ and defined by
$
F ( x )=\begin{array}{ll}
0, & \text { for all } x \leq a \\
\int_{ a }^x f(x) d x, & \text { for all } x \geq a
\end{array}
$
$
F ( x )=\begin{array}{ll}
0, & \text { for all } x \leq a \\
\int_{ a }^x f(x) d x, & \text { for all } x \geq a
\end{array}
$