If
\[
F(x)=
\begin{cases}
0, & x[2mm]
\left(\dfrac{x+7}{a}\right), & -7[2mm]
1, & x>7,
\end{cases}
\]
represents the probability distribution function of a continuous random variable, then \(a=\)
Show Hint
For a cumulative distribution function,
\[
\boxed{
F(-\infty)=0,
\qquad
F(\infty)=1.
}
\]
Use continuity at the boundary points to determine unknown constants.