The waiting line at a popular bakery shop can be quite long. Suppose that the waiting time in minutes has probability density function
$f(x) = 0.2 \cdot e^{-0.2x}$. Determine the following:
(a) $F(x)$.
$F(x) = \frac{1}{e^{-0.2x}}$
$F(x) = 1 - e^{-0.2x}$
$F(x) = 1 + e^{-0.2x}$
$F(x) = 1 - e^{0.2x}$